TY  - JOUR
AU  - Elezovic, N. R.
AU  - Radmilovíć, Velimir R.
AU  - Kovač, Janez
AU  - Babić, Biljana M.
AU  - Gajic-Krstajic, Lj. M.
AU  - Krstajic, N. V.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/404
AB  - A platinum nanocatalyst on Sb doped tin oxide support (Sb-SnO2) was synthesized and characterized as a catalyst for oxygen reduction reaction in 0.1 mol dm(-3) NaOH solution at 25 degrees C. Sb (5%) doped tin oxide support was synthesized by a modified hydrazine reduction procedure. The platinum nanocatalyst (20% Pt) on Sb-SnO2 support was synthesized by a borohydride reduction method. The synthesized support and catalyst were characterized by high resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS) and X-ray diffraction technique (XRD). X-ray photoelectron spectroscopy was applied to characterize the chemical status of elements before and after Pt-treatment. XPS spectra of Sn 3d, Pt 4f, Sb 3d and O 1s revealed that the Pt-deposition on Sb-SnO2 support induced the reduction of the Sn(4+) oxidation state to Sn(2+) and Sn(0) states, while Pt remained in the metallic state and Sb was in the (3+) oxidation state. Homogenous Pt nanoparticle distribution over the support, without pronounced particle agglomeration, was confirmed by HRTEM technique. The average Pt particle size was 2.9 nm. The electrochemically active Pt surface area of the catalyst was determined by the integration of the cyclic voltammetry curve in the potential region of underpotential deposition of hydrogen, after double layer charge correction, taking into account the reference value of 210 mu C cm(-2) for full monolayer coverage. This calculation gave the value of 51 m(2) g(-1). The kinetics of the oxygen reduction reaction with Pt/[Sb-SnO2 catalyst was studied by cyclic voltammetry and linear sweep voltammetry using a rotating gold disc electrode. Two different Tafel slopes were observed: one close to 60 mV dec(-1) in the low current density region, and another at similar to 120 mV dec(-1) in the higher current densities region, as was already referred in previous reports for the oxygen reduction reaction with polycrystalline Pt, as well as with different Pt based nanocatalysts. The specific activities for oxygen reduction, expressed in terms of kinetic current densities per electrochemically Pt active surface area, as well as per mass of Pt loaded, at the constant potential of practical interest (0.85 V and 0.90 V vs. RHE), were compared to a carbon supported (Vulcan XC-72) catalyst. The Pt/[Sb-SnO2 catalyst exhibited similar catalytic activity for oxygen reduction reaction like carbon supported one. The advantages of the carbon free support application in terms of the durability and stability of the catalysts were proved by accelerated stability tests.
T2  - RSC Advances
T1  - Pt nanoparticles on tin oxide based support as a beneficial catalyst for oxygen reduction in alkaline solutions
VL  - 5
IS  - 21
SP  - 15923
EP  - 15929
DO  - 10.1039/c4ra13391a
ER  - 

@article{
author = "Elezovic, N. R. and Radmilovíć, Velimir R. and Kovač, Janez and Babić, Biljana M. and Gajic-Krstajic, Lj. M. and Krstajic, N. V.",
year = "2015",
abstract = "A platinum nanocatalyst on Sb doped tin oxide support (Sb-SnO2) was synthesized and characterized as a catalyst for oxygen reduction reaction in 0.1 mol dm(-3) NaOH solution at 25 degrees C. Sb (5%) doped tin oxide support was synthesized by a modified hydrazine reduction procedure. The platinum nanocatalyst (20% Pt) on Sb-SnO2 support was synthesized by a borohydride reduction method. The synthesized support and catalyst were characterized by high resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS) and X-ray diffraction technique (XRD). X-ray photoelectron spectroscopy was applied to characterize the chemical status of elements before and after Pt-treatment. XPS spectra of Sn 3d, Pt 4f, Sb 3d and O 1s revealed that the Pt-deposition on Sb-SnO2 support induced the reduction of the Sn(4+) oxidation state to Sn(2+) and Sn(0) states, while Pt remained in the metallic state and Sb was in the (3+) oxidation state. Homogenous Pt nanoparticle distribution over the support, without pronounced particle agglomeration, was confirmed by HRTEM technique. The average Pt particle size was 2.9 nm. The electrochemically active Pt surface area of the catalyst was determined by the integration of the cyclic voltammetry curve in the potential region of underpotential deposition of hydrogen, after double layer charge correction, taking into account the reference value of 210 mu C cm(-2) for full monolayer coverage. This calculation gave the value of 51 m(2) g(-1). The kinetics of the oxygen reduction reaction with Pt/[Sb-SnO2 catalyst was studied by cyclic voltammetry and linear sweep voltammetry using a rotating gold disc electrode. Two different Tafel slopes were observed: one close to 60 mV dec(-1) in the low current density region, and another at similar to 120 mV dec(-1) in the higher current densities region, as was already referred in previous reports for the oxygen reduction reaction with polycrystalline Pt, as well as with different Pt based nanocatalysts. The specific activities for oxygen reduction, expressed in terms of kinetic current densities per electrochemically Pt active surface area, as well as per mass of Pt loaded, at the constant potential of practical interest (0.85 V and 0.90 V vs. RHE), were compared to a carbon supported (Vulcan XC-72) catalyst. The Pt/[Sb-SnO2 catalyst exhibited similar catalytic activity for oxygen reduction reaction like carbon supported one. The advantages of the carbon free support application in terms of the durability and stability of the catalysts were proved by accelerated stability tests.",
journal = "RSC Advances",
title = "Pt nanoparticles on tin oxide based support as a beneficial catalyst for oxygen reduction in alkaline solutions",
volume = "5",
number = "21",
pages = "15923-15929",
doi = "10.1039/c4ra13391a"
}

Elezovic, N. R., Radmilovíć, V. R., Kovač, J., Babić, B. M., Gajic-Krstajic, Lj. M.,& Krstajic, N. V.. (2015). Pt nanoparticles on tin oxide based support as a beneficial catalyst for oxygen reduction in alkaline solutions. in RSC Advances, 5(21), 15923-15929.
https://doi.org/10.1039/c4ra13391a

Elezovic NR, Radmilovíć VR, Kovač J, Babić BM, Gajic-Krstajic LM, Krstajic NV. Pt nanoparticles on tin oxide based support as a beneficial catalyst for oxygen reduction in alkaline solutions. in RSC Advances. 2015;5(21):15923-15929.
doi:10.1039/c4ra13391a .

Elezovic, N. R., Radmilovíć, Velimir R., Kovač, Janez, Babić, Biljana M., Gajic-Krstajic, Lj. M., Krstajic, N. V., "Pt nanoparticles on tin oxide based support as a beneficial catalyst for oxygen reduction in alkaline solutions" in RSC Advances, 5, no. 21 (2015):15923-15929,
https://doi.org/10.1039/c4ra13391a . .

TY  - JOUR
AU  - Elezovic, N. R.
AU  - Ercius, P.
AU  - Kovač, Janez
AU  - Radmilovíć, Velimir R.
AU  - Babić, Biljana M.
AU  - Krstajic, N. V.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/420
AB  - Ruthenium oxide/titanium oxide, with a Ru:Ti atomic ratio of 7:3 was synthesized by modified sol-gel procedure and used as a support for platinum nanocatalyst for oxygen reduction reaction. The synthesized materials were characterized in terms of morphology, particle size distribution, chemical and phase composition by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), high angle annular dark filed scanning transmission electron microscopy (HAADF, STEM) and electron energy loss spectroscopy (EELS). XPS spectra revealed that Ru atoms were in mainly in Ru(4+) oxidation state, the Ti atoms in Ti(4+) oxidation state, whereas the Pt-atoms were in metallic state. TEM analysis proved that platinum nanoparticles nucleated at both oxide species and homogeneous distribution was observed. The average platinum nanoparticle size was 3.05 nm. Electrochemically active surface area of platinum was 32 m(2) g(-1). Kinetics of the oxygen reduction was studied at rotating disc electrode in 0.5 mol dm(-3) HClO4 solution, at 25 degrees C. The catalytic activities expressed in terms of specific activity (per electrochemically active surface area of platinum) and mass activity (per mass of platinum) were determined and compared to Pt catalyst on carbon support. The high catalytic activity was proven by electrochemical characterization. (C) 2014 Elsevier B.V. All rights reserved.
T2  - Journal of Electroanalytical Chemistry
T1  - Synthesis and characterization of Pt nanocatalyst on Ru0.7Ti0.3O2 support as a cathode for fuel cells application
VL  - 739
SP  - 164
EP  - 171
DO  - 10.1016/j.jelechem.2014.12.033
ER  - 

@article{
author = "Elezovic, N. R. and Ercius, P. and Kovač, Janez and Radmilovíć, Velimir R. and Babić, Biljana M. and Krstajic, N. V.",
year = "2015",
abstract = "Ruthenium oxide/titanium oxide, with a Ru:Ti atomic ratio of 7:3 was synthesized by modified sol-gel procedure and used as a support for platinum nanocatalyst for oxygen reduction reaction. The synthesized materials were characterized in terms of morphology, particle size distribution, chemical and phase composition by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), high angle annular dark filed scanning transmission electron microscopy (HAADF, STEM) and electron energy loss spectroscopy (EELS). XPS spectra revealed that Ru atoms were in mainly in Ru(4+) oxidation state, the Ti atoms in Ti(4+) oxidation state, whereas the Pt-atoms were in metallic state. TEM analysis proved that platinum nanoparticles nucleated at both oxide species and homogeneous distribution was observed. The average platinum nanoparticle size was 3.05 nm. Electrochemically active surface area of platinum was 32 m(2) g(-1). Kinetics of the oxygen reduction was studied at rotating disc electrode in 0.5 mol dm(-3) HClO4 solution, at 25 degrees C. The catalytic activities expressed in terms of specific activity (per electrochemically active surface area of platinum) and mass activity (per mass of platinum) were determined and compared to Pt catalyst on carbon support. The high catalytic activity was proven by electrochemical characterization. (C) 2014 Elsevier B.V. All rights reserved.",
journal = "Journal of Electroanalytical Chemistry",
title = "Synthesis and characterization of Pt nanocatalyst on Ru0.7Ti0.3O2 support as a cathode for fuel cells application",
volume = "739",
pages = "164-171",
doi = "10.1016/j.jelechem.2014.12.033"
}

Elezovic, N. R., Ercius, P., Kovač, J., Radmilovíć, V. R., Babić, B. M.,& Krstajic, N. V.. (2015). Synthesis and characterization of Pt nanocatalyst on Ru0.7Ti0.3O2 support as a cathode for fuel cells application. in Journal of Electroanalytical Chemistry, 739, 164-171.
https://doi.org/10.1016/j.jelechem.2014.12.033

Elezovic NR, Ercius P, Kovač J, Radmilovíć VR, Babić BM, Krstajic NV. Synthesis and characterization of Pt nanocatalyst on Ru0.7Ti0.3O2 support as a cathode for fuel cells application. in Journal of Electroanalytical Chemistry. 2015;739:164-171.
doi:10.1016/j.jelechem.2014.12.033 .

Elezovic, N. R., Ercius, P., Kovač, Janez, Radmilovíć, Velimir R., Babić, Biljana M., Krstajic, N. V., "Synthesis and characterization of Pt nanocatalyst on Ru0.7Ti0.3O2 support as a cathode for fuel cells application" in Journal of Electroanalytical Chemistry, 739 (2015):164-171,
https://doi.org/10.1016/j.jelechem.2014.12.033 . .

TY  - JOUR
AU  - Obradović, Maja D.
AU  - Lacnjevac, U. C.
AU  - Babić, Biljana M.
AU  - Ercius, P.
AU  - Radmilovíć, Velimir R.
AU  - Krstajic, N. V.
AU  - Gojković, Snežana Lj.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/468
AB  - Two binary Ru-Ti oxides, Rum Ti0.9O2 and Ru0.7Ti0.3O2, were synthesized by the sol-gel method and used as an electrocatalyst support. The system was characterized by XRD, EDS, TEM and cyclic voltammetry. The Rum Ti0.9O2 and Ru0.7Ti0.3O2 consist of two phases of anatase and rutile structure. An average size of the Pt nanoparticles supported on them is similar to 3.5 nm and they are deposited on both Ru and Ti-rich domains. The supports exhibited good conductivity and electrochemical stability. The onset potentials of COads oxidation on the synthesized catalysts and on commercial PtRu/C are similar to each other and lower than that on Pt/C. This suggests that in Pt/Rum Ti0.9O2 and Pt/Ru0(.7)Ti(0.3)O(2) the Pt nanoparticles are in close contact with Ru atoms from the support, which enables the bifunctional mechanism. The activity and stability of the catalysts for methanol oxidation were examined under potentiodynamic and potentiostatic conditions. While the activity of Pt/Rum Ti0.9O2 is unsatisfactory, the performance of Pt/Ru0.7Ti0.3O2 is comparable to PtRu/C. For example, in the potentiostatic test at 0.5 V the activities after 25 min are 0.035 mA cm(-2) and 0.022 mA cm(-2) for Pt/Ru0.7Ti0.3O2 and PtRu/C, respectively. In potentiodynamic test the activities at 0.5V after 250 cycles are around 0.02 mA cm(-2) for both catalysts. (C) 2015 Elsevier B.V. All rights reserved.
T2  - Applied Catalysis. B: Environmental
T1  - RuxTi1-xO2 as the support for Pt nanoparticles: Electrocatalysis of methanol oxidation
VL  - 170
SP  - 144
EP  - 152
DO  - 10.1016/j.apcatb.2015.01.038
ER  - 

@article{
author = "Obradović, Maja D. and Lacnjevac, U. C. and Babić, Biljana M. and Ercius, P. and Radmilovíć, Velimir R. and Krstajic, N. V. and Gojković, Snežana Lj.",
year = "2015",
abstract = "Two binary Ru-Ti oxides, Rum Ti0.9O2 and Ru0.7Ti0.3O2, were synthesized by the sol-gel method and used as an electrocatalyst support. The system was characterized by XRD, EDS, TEM and cyclic voltammetry. The Rum Ti0.9O2 and Ru0.7Ti0.3O2 consist of two phases of anatase and rutile structure. An average size of the Pt nanoparticles supported on them is similar to 3.5 nm and they are deposited on both Ru and Ti-rich domains. The supports exhibited good conductivity and electrochemical stability. The onset potentials of COads oxidation on the synthesized catalysts and on commercial PtRu/C are similar to each other and lower than that on Pt/C. This suggests that in Pt/Rum Ti0.9O2 and Pt/Ru0(.7)Ti(0.3)O(2) the Pt nanoparticles are in close contact with Ru atoms from the support, which enables the bifunctional mechanism. The activity and stability of the catalysts for methanol oxidation were examined under potentiodynamic and potentiostatic conditions. While the activity of Pt/Rum Ti0.9O2 is unsatisfactory, the performance of Pt/Ru0.7Ti0.3O2 is comparable to PtRu/C. For example, in the potentiostatic test at 0.5 V the activities after 25 min are 0.035 mA cm(-2) and 0.022 mA cm(-2) for Pt/Ru0.7Ti0.3O2 and PtRu/C, respectively. In potentiodynamic test the activities at 0.5V after 250 cycles are around 0.02 mA cm(-2) for both catalysts. (C) 2015 Elsevier B.V. All rights reserved.",
journal = "Applied Catalysis. B: Environmental",
title = "RuxTi1-xO2 as the support for Pt nanoparticles: Electrocatalysis of methanol oxidation",
volume = "170",
pages = "144-152",
doi = "10.1016/j.apcatb.2015.01.038"
}

Obradović, M. D., Lacnjevac, U. C., Babić, B. M., Ercius, P., Radmilovíć, V. R., Krstajic, N. V.,& Gojković, S. Lj.. (2015). RuxTi1-xO2 as the support for Pt nanoparticles: Electrocatalysis of methanol oxidation. in Applied Catalysis. B: Environmental, 170, 144-152.
https://doi.org/10.1016/j.apcatb.2015.01.038

Obradović MD, Lacnjevac UC, Babić BM, Ercius P, Radmilovíć VR, Krstajic NV, Gojković SL. RuxTi1-xO2 as the support for Pt nanoparticles: Electrocatalysis of methanol oxidation. in Applied Catalysis. B: Environmental. 2015;170:144-152.
doi:10.1016/j.apcatb.2015.01.038 .

Obradović, Maja D., Lacnjevac, U. C., Babić, Biljana M., Ercius, P., Radmilovíć, Velimir R., Krstajic, N. V., Gojković, Snežana Lj., "RuxTi1-xO2 as the support for Pt nanoparticles: Electrocatalysis of methanol oxidation" in Applied Catalysis. B: Environmental, 170 (2015):144-152,
https://doi.org/10.1016/j.apcatb.2015.01.038 . .

TY  - JOUR
AU  - Elezovic, N. R.
AU  - Babić, Biljana M.
AU  - Radmilovíć, Velimir R.
AU  - Vracar, Lj. M.
AU  - Krstajic, N. V.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5591
AB  - Ruthenium doped titanium oxide support was synthesized. The support was characterized by BET (Brunauer, Emmett, Teller) and X-ray diffraction techniques (XRD). Determined specific surface area was 41 m(2) g(-1). XRD revealed presence mainly TiO2 anatase phase and some peaks belonging to rutile phase. No Ru compounds have been detected. Platinum based catalyst on this support was prepared by borohydride reduction method. The catalyst was characterized by scanning transmission electron microscopy (STEM, HAADF) and electron energy loss spectroscopy (EELS). Homogenous Pt particle distribution over the support, with average Pt nanoparticle diameter of 3 nm was found. This novel catalyst was tested for oxygen reduction in acid solution. It exhibited remarkable higher catalytic activity in comparison with Pt/C, as well as with Pt nanocatalysts at titanium oxide based supports, reported in literature. (C) 2013 Elsevier B.V. All rights reserved.
T2  - Applied Catalysis. B: Environmental
T1  - Novel Pt catalyst on ruthenium doped TiO2 support for oxygen reduction reaction
VL  - 140
SP  - 206
EP  - 212
DO  - 10.1016/j.apcatb.2013.04.012
ER  - 

@article{
author = "Elezovic, N. R. and Babić, Biljana M. and Radmilovíć, Velimir R. and Vracar, Lj. M. and Krstajic, N. V.",
year = "2013",
abstract = "Ruthenium doped titanium oxide support was synthesized. The support was characterized by BET (Brunauer, Emmett, Teller) and X-ray diffraction techniques (XRD). Determined specific surface area was 41 m(2) g(-1). XRD revealed presence mainly TiO2 anatase phase and some peaks belonging to rutile phase. No Ru compounds have been detected. Platinum based catalyst on this support was prepared by borohydride reduction method. The catalyst was characterized by scanning transmission electron microscopy (STEM, HAADF) and electron energy loss spectroscopy (EELS). Homogenous Pt particle distribution over the support, with average Pt nanoparticle diameter of 3 nm was found. This novel catalyst was tested for oxygen reduction in acid solution. It exhibited remarkable higher catalytic activity in comparison with Pt/C, as well as with Pt nanocatalysts at titanium oxide based supports, reported in literature. (C) 2013 Elsevier B.V. All rights reserved.",
journal = "Applied Catalysis. B: Environmental",
title = "Novel Pt catalyst on ruthenium doped TiO2 support for oxygen reduction reaction",
volume = "140",
pages = "206-212",
doi = "10.1016/j.apcatb.2013.04.012"
}

Elezovic, N. R., Babić, B. M., Radmilovíć, V. R., Vracar, Lj. M.,& Krstajic, N. V.. (2013). Novel Pt catalyst on ruthenium doped TiO2 support for oxygen reduction reaction. in Applied Catalysis. B: Environmental, 140, 206-212.
https://doi.org/10.1016/j.apcatb.2013.04.012

Elezovic NR, Babić BM, Radmilovíć VR, Vracar LM, Krstajic NV. Novel Pt catalyst on ruthenium doped TiO2 support for oxygen reduction reaction. in Applied Catalysis. B: Environmental. 2013;140:206-212.
doi:10.1016/j.apcatb.2013.04.012 .

Elezovic, N. R., Babić, Biljana M., Radmilovíć, Velimir R., Vracar, Lj. M., Krstajic, N. V., "Novel Pt catalyst on ruthenium doped TiO2 support for oxygen reduction reaction" in Applied Catalysis. B: Environmental, 140 (2013):206-212,
https://doi.org/10.1016/j.apcatb.2013.04.012 . .

TY  - JOUR
AU  - Elezovic, N. R.
AU  - Babić, Biljana M.
AU  - Radmilovíć, Velimir R.
AU  - Krstajic, N. V.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5733
AB  - The oxygen reduction reaction was studied at Pt nanocatalysts on two different tin oxide based supports, Sb-SnO2 and Ru-SnO2, in acid solution. Tin oxide based supports were synthesized by hydrazine reduction method. Physical characterization of the supports was performed by BET, X-ray diffraction and TEM techniques. SnO2 belonging peaks were detected in Sb-SnO2 powder, while Ru-SnO2 XRD diffraction patterns contained peaks of RuO2 and SnO2. The average crystallite sizes, determined by Scherrer equation, were 3 nm and 4 nm for Sb-SnO2 and Ru-SnO2, respectively. Pt catalysts on Sb-SnO2 and Ru-SnO2 supports were synthesized by borohydride reduction method. TEM analysis revealed homogeneous particle size distribution, with average particle size of 2.9 and 5.4 nm, for Sb-SnO2 and Ru-SnO2, respectively. Electrocatalytic activity and stability of these catalysts for oxygen reduction were studied by cyclic voltammetry and linear sweep voltammetry at rotating disk electrode (RDE). Pt catalysts on Sb and Ru doped SnO2 support exhibited catalytic activities comparable to Pt on commercial carbon based support. Stability tests were also performed. Determined small loss of electrochemical active surface area of the Pt catalyst on Sb doped tin oxide support, after repetitive cycling, indicated high stability and durability of this cathode for-prospective fuel cells application. (C) 2013 The Electrochemical Society. All rights reserved.
T2  - Journal of the Electrochemical Society
T1  - Synthesis and Characterization of Pt Catalysts on SnO2 Based Supports for Oxygen Reduction Reaction
VL  - 160
IS  - 10
SP  - F1151
EP  - F1158
DO  - 10.1149/2.095310jes
ER  - 

@article{
author = "Elezovic, N. R. and Babić, Biljana M. and Radmilovíć, Velimir R. and Krstajic, N. V.",
year = "2013",
abstract = "The oxygen reduction reaction was studied at Pt nanocatalysts on two different tin oxide based supports, Sb-SnO2 and Ru-SnO2, in acid solution. Tin oxide based supports were synthesized by hydrazine reduction method. Physical characterization of the supports was performed by BET, X-ray diffraction and TEM techniques. SnO2 belonging peaks were detected in Sb-SnO2 powder, while Ru-SnO2 XRD diffraction patterns contained peaks of RuO2 and SnO2. The average crystallite sizes, determined by Scherrer equation, were 3 nm and 4 nm for Sb-SnO2 and Ru-SnO2, respectively. Pt catalysts on Sb-SnO2 and Ru-SnO2 supports were synthesized by borohydride reduction method. TEM analysis revealed homogeneous particle size distribution, with average particle size of 2.9 and 5.4 nm, for Sb-SnO2 and Ru-SnO2, respectively. Electrocatalytic activity and stability of these catalysts for oxygen reduction were studied by cyclic voltammetry and linear sweep voltammetry at rotating disk electrode (RDE). Pt catalysts on Sb and Ru doped SnO2 support exhibited catalytic activities comparable to Pt on commercial carbon based support. Stability tests were also performed. Determined small loss of electrochemical active surface area of the Pt catalyst on Sb doped tin oxide support, after repetitive cycling, indicated high stability and durability of this cathode for-prospective fuel cells application. (C) 2013 The Electrochemical Society. All rights reserved.",
journal = "Journal of the Electrochemical Society",
title = "Synthesis and Characterization of Pt Catalysts on SnO2 Based Supports for Oxygen Reduction Reaction",
volume = "160",
number = "10",
pages = "F1151-F1158",
doi = "10.1149/2.095310jes"
}

Elezovic, N. R., Babić, B. M., Radmilovíć, V. R.,& Krstajic, N. V.. (2013). Synthesis and Characterization of Pt Catalysts on SnO2 Based Supports for Oxygen Reduction Reaction. in Journal of the Electrochemical Society, 160(10), F1151-F1158.
https://doi.org/10.1149/2.095310jes

Elezovic NR, Babić BM, Radmilovíć VR, Krstajic NV. Synthesis and Characterization of Pt Catalysts on SnO2 Based Supports for Oxygen Reduction Reaction. in Journal of the Electrochemical Society. 2013;160(10):F1151-F1158.
doi:10.1149/2.095310jes .

Elezovic, N. R., Babić, Biljana M., Radmilovíć, Velimir R., Krstajic, N. V., "Synthesis and Characterization of Pt Catalysts on SnO2 Based Supports for Oxygen Reduction Reaction" in Journal of the Electrochemical Society, 160, no. 10 (2013):F1151-F1158,
https://doi.org/10.1149/2.095310jes . .

TY  - JOUR
AU  - Obradović, Maja D.
AU  - Babić, Biljana M.
AU  - Radmilovíć, Velimir R.
AU  - Krstajic, N. V.
AU  - Gojković, Snežana Lj.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4946
AB  - Tungsten carbide was synthesized by calcination of carbon cryogel containing tungsten in a form of metatungstate. Characterization by X-ray diffraction and transmission electron microscopy indicated core-shell structure of the particles with tungsten core and tungsten carbide shell, attached to graphitized carbon. Pt nanoparticles were deposited on this material and most of them were nucleated on tungsten carbide. Cyclic voltammetry of W-C support and Pt/W-C catalyst indicated hydrogen intercalation in surface hydrous tungsten oxide. Oxidation of COads on Pt/W-C commences earlier than on Pt/C for about 100 mV. The onset potentials of MOR on Pt/W-C and Pt/C are the same, but at more positive potentials Pt/W-C catalyst is more active. It was proposed that promotion of MOR is based on bifunctional mechanism that facilitates COads removal. Stability test was performed by potential cycling of Pt/W-C and Pt/C in the supporting electrolyte and in the presence of methanol. Pt surface area loss observed in the supporting electrolyte of both catalysts after 250 cycles was about 20%. Decrease in the activity for methanol oxidation was 30% for Pt/W-C, but even 48% for Pt/C. The difference was explained by the presence of hydrous tungsten oxide on Pt in Pt/W-C catalyst, which reduces accumulation of poisoning COads. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
T2  - International Journal of Hydrogen Energy
T1  - Core-shell structured tungsten-tungsten carbide as a Pt catalyst support and its activity for methanol electrooxidation
VL  - 37
IS  - 14
SP  - 10671
EP  - 10679
DO  - 10.1016/j.ijhydene.2012.04.114
ER  - 

@article{
author = "Obradović, Maja D. and Babić, Biljana M. and Radmilovíć, Velimir R. and Krstajic, N. V. and Gojković, Snežana Lj.",
year = "2012",
abstract = "Tungsten carbide was synthesized by calcination of carbon cryogel containing tungsten in a form of metatungstate. Characterization by X-ray diffraction and transmission electron microscopy indicated core-shell structure of the particles with tungsten core and tungsten carbide shell, attached to graphitized carbon. Pt nanoparticles were deposited on this material and most of them were nucleated on tungsten carbide. Cyclic voltammetry of W-C support and Pt/W-C catalyst indicated hydrogen intercalation in surface hydrous tungsten oxide. Oxidation of COads on Pt/W-C commences earlier than on Pt/C for about 100 mV. The onset potentials of MOR on Pt/W-C and Pt/C are the same, but at more positive potentials Pt/W-C catalyst is more active. It was proposed that promotion of MOR is based on bifunctional mechanism that facilitates COads removal. Stability test was performed by potential cycling of Pt/W-C and Pt/C in the supporting electrolyte and in the presence of methanol. Pt surface area loss observed in the supporting electrolyte of both catalysts after 250 cycles was about 20%. Decrease in the activity for methanol oxidation was 30% for Pt/W-C, but even 48% for Pt/C. The difference was explained by the presence of hydrous tungsten oxide on Pt in Pt/W-C catalyst, which reduces accumulation of poisoning COads. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.",
journal = "International Journal of Hydrogen Energy",
title = "Core-shell structured tungsten-tungsten carbide as a Pt catalyst support and its activity for methanol electrooxidation",
volume = "37",
number = "14",
pages = "10671-10679",
doi = "10.1016/j.ijhydene.2012.04.114"
}

Obradović, M. D., Babić, B. M., Radmilovíć, V. R., Krstajic, N. V.,& Gojković, S. Lj.. (2012). Core-shell structured tungsten-tungsten carbide as a Pt catalyst support and its activity for methanol electrooxidation. in International Journal of Hydrogen Energy, 37(14), 10671-10679.
https://doi.org/10.1016/j.ijhydene.2012.04.114

Obradović MD, Babić BM, Radmilovíć VR, Krstajic NV, Gojković SL. Core-shell structured tungsten-tungsten carbide as a Pt catalyst support and its activity for methanol electrooxidation. in International Journal of Hydrogen Energy. 2012;37(14):10671-10679.
doi:10.1016/j.ijhydene.2012.04.114 .

Obradović, Maja D., Babić, Biljana M., Radmilovíć, Velimir R., Krstajic, N. V., Gojković, Snežana Lj., "Core-shell structured tungsten-tungsten carbide as a Pt catalyst support and its activity for methanol electrooxidation" in International Journal of Hydrogen Energy, 37, no. 14 (2012):10671-10679,
https://doi.org/10.1016/j.ijhydene.2012.04.114 . .

TY  - JOUR
AU  - Elezovic, N. R.
AU  - Babić, Biljana M.
AU  - Ercius, P.
AU  - Radmilovíć, Velimir R.
AU  - Vracar, Lj. M.
AU  - Krstajic, N. V.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5037
AB  - Platinum nanocatalysts on two tungsten based supports have been synthesized and characterized as catalysts for oxygen reduction reaction in 0.5 mol dm(-3) HClO4 solution, at 25 degrees C. Tungsten based support assigned WCctabr has been synthesized by polycondensation of resorcinol and formaldehyde in the presence of CTABr surfactant. Support assigned WCwo(3) was synthesized from resorcinol/formaldehyde gel, using WO3 nanoparticles as starting material. Supporting materials have been characterized by BET (Brunauer, Emmett and Teller) technique and determined values of surface area were 80 m(2) g(-1) for WCctabr and 175 m(2) g(-1) for WCWO3. Platinum nanocatalysts (10% Pt) at tungsten based supports have been prepared by borohydride reduction method. Both synthesized supports and catalysts have been characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS) techniques. Cyclic voltammetry was applied for determination of electrochemically active surface area (40 m2 g(-1) for Pt/WCWO3 and 55 m(2) g(-1) for Pt/WCctabr). Oxygen reduction reaction has been studied by cyclic voltammetry and linear sweep voltammetry at rotating disc electrode (RDE). These catalysts exhibited better catalytic activity, expressed in terms of kinetic current density per real surface area at the constant potential and better stability, in comparison with Pt/C catalyst, as well as with already reported catalytic activity values for Pt catalysts on tungsten based supports. (C) 2012 Elsevier B.V. All rights reserved.
T2  - Applied Catalysis. B: Environmental
T1  - Synthesis and characterization Pt nanocatalysts on tungsten based supports for oxygen reduction reaction
VL  - 125
SP  - 390
EP  - 397
DO  - 10.1016/j.apcatb.2012.06.008
ER  - 

@article{
author = "Elezovic, N. R. and Babić, Biljana M. and Ercius, P. and Radmilovíć, Velimir R. and Vracar, Lj. M. and Krstajic, N. V.",
year = "2012",
abstract = "Platinum nanocatalysts on two tungsten based supports have been synthesized and characterized as catalysts for oxygen reduction reaction in 0.5 mol dm(-3) HClO4 solution, at 25 degrees C. Tungsten based support assigned WCctabr has been synthesized by polycondensation of resorcinol and formaldehyde in the presence of CTABr surfactant. Support assigned WCwo(3) was synthesized from resorcinol/formaldehyde gel, using WO3 nanoparticles as starting material. Supporting materials have been characterized by BET (Brunauer, Emmett and Teller) technique and determined values of surface area were 80 m(2) g(-1) for WCctabr and 175 m(2) g(-1) for WCWO3. Platinum nanocatalysts (10% Pt) at tungsten based supports have been prepared by borohydride reduction method. Both synthesized supports and catalysts have been characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS) techniques. Cyclic voltammetry was applied for determination of electrochemically active surface area (40 m2 g(-1) for Pt/WCWO3 and 55 m(2) g(-1) for Pt/WCctabr). Oxygen reduction reaction has been studied by cyclic voltammetry and linear sweep voltammetry at rotating disc electrode (RDE). These catalysts exhibited better catalytic activity, expressed in terms of kinetic current density per real surface area at the constant potential and better stability, in comparison with Pt/C catalyst, as well as with already reported catalytic activity values for Pt catalysts on tungsten based supports. (C) 2012 Elsevier B.V. All rights reserved.",
journal = "Applied Catalysis. B: Environmental",
title = "Synthesis and characterization Pt nanocatalysts on tungsten based supports for oxygen reduction reaction",
volume = "125",
pages = "390-397",
doi = "10.1016/j.apcatb.2012.06.008"
}

Elezovic, N. R., Babić, B. M., Ercius, P., Radmilovíć, V. R., Vracar, Lj. M.,& Krstajic, N. V.. (2012). Synthesis and characterization Pt nanocatalysts on tungsten based supports for oxygen reduction reaction. in Applied Catalysis. B: Environmental, 125, 390-397.
https://doi.org/10.1016/j.apcatb.2012.06.008

Elezovic NR, Babić BM, Ercius P, Radmilovíć VR, Vracar LM, Krstajic NV. Synthesis and characterization Pt nanocatalysts on tungsten based supports for oxygen reduction reaction. in Applied Catalysis. B: Environmental. 2012;125:390-397.
doi:10.1016/j.apcatb.2012.06.008 .

Elezovic, N. R., Babić, Biljana M., Ercius, P., Radmilovíć, Velimir R., Vracar, Lj. M., Krstajic, N. V., "Synthesis and characterization Pt nanocatalysts on tungsten based supports for oxygen reduction reaction" in Applied Catalysis. B: Environmental, 125 (2012):390-397,
https://doi.org/10.1016/j.apcatb.2012.06.008 . .

TY  - JOUR
AU  - Elezovic, N. R.
AU  - Babić, Biljana M.
AU  - Gajic-Krstajic, Lj.
AU  - Ercius, P.
AU  - Radmilovíć, Velimir R.
AU  - Krstajic, N. V.
AU  - Vracar, Lj. M.
PY  - 2012
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4846
AB  - Platinum nanocatalyst at nano-tungsten carbide was synthesized, characterized and tested for oxygen reduction reaction (ORR) in 0.1 mol dm(-3) NaOH, at 25 degrees C. Tungsten-carbide islands on nano-tungsten particles (WC) was synthesized from gel prepared by using nanoparticles of WO3, previously produced from W-powder oxidized in H2O2. The support was porous material with high specific surface area (177 m(2)g(-1)). The WC supported Pt (10 wt.%) catalyst was prepared by borohydride reduction method. X-ray diffraction of the catalyst demonstrates successful reduction of Pt precursor to metallic form. STEM analysis of Pt/WC catalyst showed the existence of Pt particles lower than 2 nm in size, even the clusters of Pt atoms. Electrochemically active surface area of Pt was determined from adsorption/desorption charge of hydrogen atoms. Catalytic activity of the synthesized catalyst for ORR was studied by cyclic voltammetry and linear sweep voltammetry at rotating disk electrode. The onset potential on Pt/WC for ORR, comparing with Pt/Vulcan, was shifted to the positive potentials for about 150 mV. Pt/WC catalyst shows one Tafel slope of -0.105 V dec(-1), remarkable catalytic activity expressed either through the value of the current density per real surface area, or through the mass activity and excellent stability. (C) 2012 Elsevier Ltd. All rights reserved.
T2  - Electrochimica Acta
T1  - Pt supported on nano-tungsten carbide as a beneficial catalyst for the oxygen reduction reaction in alkaline solution
VL  - 69
SP  - 239
EP  - 246
DO  - 10.1016/j.electacta.2012.02.105
ER  - 

@article{
author = "Elezovic, N. R. and Babić, Biljana M. and Gajic-Krstajic, Lj. and Ercius, P. and Radmilovíć, Velimir R. and Krstajic, N. V. and Vracar, Lj. M.",
year = "2012",
abstract = "Platinum nanocatalyst at nano-tungsten carbide was synthesized, characterized and tested for oxygen reduction reaction (ORR) in 0.1 mol dm(-3) NaOH, at 25 degrees C. Tungsten-carbide islands on nano-tungsten particles (WC) was synthesized from gel prepared by using nanoparticles of WO3, previously produced from W-powder oxidized in H2O2. The support was porous material with high specific surface area (177 m(2)g(-1)). The WC supported Pt (10 wt.%) catalyst was prepared by borohydride reduction method. X-ray diffraction of the catalyst demonstrates successful reduction of Pt precursor to metallic form. STEM analysis of Pt/WC catalyst showed the existence of Pt particles lower than 2 nm in size, even the clusters of Pt atoms. Electrochemically active surface area of Pt was determined from adsorption/desorption charge of hydrogen atoms. Catalytic activity of the synthesized catalyst for ORR was studied by cyclic voltammetry and linear sweep voltammetry at rotating disk electrode. The onset potential on Pt/WC for ORR, comparing with Pt/Vulcan, was shifted to the positive potentials for about 150 mV. Pt/WC catalyst shows one Tafel slope of -0.105 V dec(-1), remarkable catalytic activity expressed either through the value of the current density per real surface area, or through the mass activity and excellent stability. (C) 2012 Elsevier Ltd. All rights reserved.",
journal = "Electrochimica Acta",
title = "Pt supported on nano-tungsten carbide as a beneficial catalyst for the oxygen reduction reaction in alkaline solution",
volume = "69",
pages = "239-246",
doi = "10.1016/j.electacta.2012.02.105"
}

Elezovic, N. R., Babić, B. M., Gajic-Krstajic, Lj., Ercius, P., Radmilovíć, V. R., Krstajic, N. V.,& Vracar, Lj. M.. (2012). Pt supported on nano-tungsten carbide as a beneficial catalyst for the oxygen reduction reaction in alkaline solution. in Electrochimica Acta, 69, 239-246.
https://doi.org/10.1016/j.electacta.2012.02.105

Elezovic NR, Babić BM, Gajic-Krstajic L, Ercius P, Radmilovíć VR, Krstajic NV, Vracar LM. Pt supported on nano-tungsten carbide as a beneficial catalyst for the oxygen reduction reaction in alkaline solution. in Electrochimica Acta. 2012;69:239-246.
doi:10.1016/j.electacta.2012.02.105 .

Elezovic, N. R., Babić, Biljana M., Gajic-Krstajic, Lj., Ercius, P., Radmilovíć, Velimir R., Krstajic, N. V., Vracar, Lj. M., "Pt supported on nano-tungsten carbide as a beneficial catalyst for the oxygen reduction reaction in alkaline solution" in Electrochimica Acta, 69 (2012):239-246,
https://doi.org/10.1016/j.electacta.2012.02.105 . .

TY  - JOUR
AU  - Elezovic, N. R.
AU  - Babić, Biljana M.
AU  - Radmilovíć, Velimir R.
AU  - Vracar, Lj. M.
AU  - Krstajic, N. V.
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4526
AB  - Platinum based nanocatalyst at home made Nb-TiO2 support was synthesized and characterized as the catalyst for oxygen reduction reaction in 0.1 mol dm(-3) NaOH, at 25 degrees C. Nb doped TiO2 catalyst support, containing 5% of Nb, has been synthesized by modified acid-catalyzed sol-gel procedure in non-aqueous medium. BET and X-ray diffraction (XRD) techniques were applied for characterization of synthesized supporting material. XRD analysis revealed only presence of anatase TiO2 phase in synthesized support powder. Existence of any peaks belonging to Nb compounds has not been observed, indicating Nb incorporated into the lattice. Nb-TiO2 supported Pt nanocatalyst synthesized, using borohydride reduction method, was characterized by TEM and HRTEM techniques. Platinum nanoparticles distribution, over Nb doped TiO2 support, was quite homogenous. Mean particle size of about 4 nm was found with no pronounced particle agglomeration. Electrochemical techniques: cyclic voltammetry and linear sweep voltammetry at rotating disc electrode were applied in order to study kinetics and estimate catalytic activity of this new catalyst for the oxygen reduction reaction in alkaline solution. Two different Tafel slopes were found: one close to -90 mV dec(-1) in low current density region and other approximately 200 my dec(-1) in high current density region, which is in good accordance with literature results for oxygen reduction at Pt single crystals, as well as Pt nanocatalysts in alkaline solutions. Similar specific catalytic activity (expressed in term of kinetic current density per real surface area) of Nb(5%)-TiO2/Pt catalyst for oxygen reduction reaction in comparison with the carbon supported platinum (Vulcan/Pt) nanocatalyst, was found. (C) 2011 Published by Elsevier Ltd.
T2  - Electrochimica Acta
T1  - Nb-TiO2 supported platinum nanocatalyst for oxygen reduction reaction in alkaline solutions
VL  - 56
IS  - 25
SP  - 9020
EP  - 9026
DO  - 10.1016/j.electacta.2011.04.075
ER  - 

@article{
author = "Elezovic, N. R. and Babić, Biljana M. and Radmilovíć, Velimir R. and Vracar, Lj. M. and Krstajic, N. V.",
year = "2011",
abstract = "Platinum based nanocatalyst at home made Nb-TiO2 support was synthesized and characterized as the catalyst for oxygen reduction reaction in 0.1 mol dm(-3) NaOH, at 25 degrees C. Nb doped TiO2 catalyst support, containing 5% of Nb, has been synthesized by modified acid-catalyzed sol-gel procedure in non-aqueous medium. BET and X-ray diffraction (XRD) techniques were applied for characterization of synthesized supporting material. XRD analysis revealed only presence of anatase TiO2 phase in synthesized support powder. Existence of any peaks belonging to Nb compounds has not been observed, indicating Nb incorporated into the lattice. Nb-TiO2 supported Pt nanocatalyst synthesized, using borohydride reduction method, was characterized by TEM and HRTEM techniques. Platinum nanoparticles distribution, over Nb doped TiO2 support, was quite homogenous. Mean particle size of about 4 nm was found with no pronounced particle agglomeration. Electrochemical techniques: cyclic voltammetry and linear sweep voltammetry at rotating disc electrode were applied in order to study kinetics and estimate catalytic activity of this new catalyst for the oxygen reduction reaction in alkaline solution. Two different Tafel slopes were found: one close to -90 mV dec(-1) in low current density region and other approximately 200 my dec(-1) in high current density region, which is in good accordance with literature results for oxygen reduction at Pt single crystals, as well as Pt nanocatalysts in alkaline solutions. Similar specific catalytic activity (expressed in term of kinetic current density per real surface area) of Nb(5%)-TiO2/Pt catalyst for oxygen reduction reaction in comparison with the carbon supported platinum (Vulcan/Pt) nanocatalyst, was found. (C) 2011 Published by Elsevier Ltd.",
journal = "Electrochimica Acta",
title = "Nb-TiO2 supported platinum nanocatalyst for oxygen reduction reaction in alkaline solutions",
volume = "56",
number = "25",
pages = "9020-9026",
doi = "10.1016/j.electacta.2011.04.075"
}

Elezovic, N. R., Babić, B. M., Radmilovíć, V. R., Vracar, Lj. M.,& Krstajic, N. V.. (2011). Nb-TiO2 supported platinum nanocatalyst for oxygen reduction reaction in alkaline solutions. in Electrochimica Acta, 56(25), 9020-9026.
https://doi.org/10.1016/j.electacta.2011.04.075

Elezovic NR, Babić BM, Radmilovíć VR, Vracar LM, Krstajic NV. Nb-TiO2 supported platinum nanocatalyst for oxygen reduction reaction in alkaline solutions. in Electrochimica Acta. 2011;56(25):9020-9026.
doi:10.1016/j.electacta.2011.04.075 .

Elezovic, N. R., Babić, Biljana M., Radmilovíć, Velimir R., Vracar, Lj. M., Krstajic, N. V., "Nb-TiO2 supported platinum nanocatalyst for oxygen reduction reaction in alkaline solutions" in Electrochimica Acta, 56, no. 25 (2011):9020-9026,
https://doi.org/10.1016/j.electacta.2011.04.075 . .

TY  - JOUR
AU  - Elezovic, N. R.
AU  - Babić, Biljana M.
AU  - Gajic-Krstajic, Lj.
AU  - Radmilović, Velimir
AU  - Krstajic, N. V.
AU  - Vracar, L. J.
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3980
AB  - In order to point out the effect of the support to the catalyst for oxygen reduction reaction nano-crystalline Nb-doped TiO2 was synthesized through a modified sol-gel route procedure. The specific surface area of the support, S-BET, and pore size distribution, were calculated from the adsorption isotherms using the gravimetric McBain method. The support was characterized by X-ray diffraction (XRD) technique. The borohydride reduction method was used to prepare Nb-TiO2 supported Pt (20 wt.%) catalyst. The synthesized catalyst was analyzed by TEM technique. Finally, the catalytic activity of this new catalyst for oxygen reduction reaction was investigated in acid solution, in the absence and the presence of methanol, and its activity was compared towards the results on C/Pt catalysts. Kinetic analysis reveals that the oxygen reduction reaction on Nb-TiO2/Pt catalyst follows four-electron process leading to water, as in the case of C/Pt electrode, but the Tafel plots normalized to the electrochemically active surface area show very remarkable enhancement in activity of Nb-TiO2/Pt expressed through the value of the current density at the constant potential. Moreover, Nb-TiO2/Pt catalyst exhibits higher methanol tolerance during the oxygen reduction reaction than the C/Pt catalyst. The enhancement in the activity of Nb-TiO2/Pt is consequence of both: the interactions of Pt nanoparticles with the support and the energy shift of the surface d-states with respect to the Fermi level what changes the surface reactivity. (C) 2010 Elsevier B.V. All rights reserved.
T2  - Journal of Power Sources
T1  - Synthesis, characterization and electrocatalytical behavior of Nb-TiO2/Pt nanocatalyst for oxygen reduction reaction
VL  - 195
IS  - 13
SP  - 3961
EP  - 3968
DO  - 10.1016/j.jpowsour.2010.01.035
ER  - 

@article{
author = "Elezovic, N. R. and Babić, Biljana M. and Gajic-Krstajic, Lj. and Radmilović, Velimir and Krstajic, N. V. and Vracar, L. J.",
year = "2010",
abstract = "In order to point out the effect of the support to the catalyst for oxygen reduction reaction nano-crystalline Nb-doped TiO2 was synthesized through a modified sol-gel route procedure. The specific surface area of the support, S-BET, and pore size distribution, were calculated from the adsorption isotherms using the gravimetric McBain method. The support was characterized by X-ray diffraction (XRD) technique. The borohydride reduction method was used to prepare Nb-TiO2 supported Pt (20 wt.%) catalyst. The synthesized catalyst was analyzed by TEM technique. Finally, the catalytic activity of this new catalyst for oxygen reduction reaction was investigated in acid solution, in the absence and the presence of methanol, and its activity was compared towards the results on C/Pt catalysts. Kinetic analysis reveals that the oxygen reduction reaction on Nb-TiO2/Pt catalyst follows four-electron process leading to water, as in the case of C/Pt electrode, but the Tafel plots normalized to the electrochemically active surface area show very remarkable enhancement in activity of Nb-TiO2/Pt expressed through the value of the current density at the constant potential. Moreover, Nb-TiO2/Pt catalyst exhibits higher methanol tolerance during the oxygen reduction reaction than the C/Pt catalyst. The enhancement in the activity of Nb-TiO2/Pt is consequence of both: the interactions of Pt nanoparticles with the support and the energy shift of the surface d-states with respect to the Fermi level what changes the surface reactivity. (C) 2010 Elsevier B.V. All rights reserved.",
journal = "Journal of Power Sources",
title = "Synthesis, characterization and electrocatalytical behavior of Nb-TiO2/Pt nanocatalyst for oxygen reduction reaction",
volume = "195",
number = "13",
pages = "3961-3968",
doi = "10.1016/j.jpowsour.2010.01.035"
}

Elezovic, N. R., Babić, B. M., Gajic-Krstajic, Lj., Radmilović, V., Krstajic, N. V.,& Vracar, L. J.. (2010). Synthesis, characterization and electrocatalytical behavior of Nb-TiO2/Pt nanocatalyst for oxygen reduction reaction. in Journal of Power Sources, 195(13), 3961-3968.
https://doi.org/10.1016/j.jpowsour.2010.01.035

Elezovic NR, Babić BM, Gajic-Krstajic L, Radmilović V, Krstajic NV, Vracar LJ. Synthesis, characterization and electrocatalytical behavior of Nb-TiO2/Pt nanocatalyst for oxygen reduction reaction. in Journal of Power Sources. 2010;195(13):3961-3968.
doi:10.1016/j.jpowsour.2010.01.035 .

Elezovic, N. R., Babić, Biljana M., Gajic-Krstajic, Lj., Radmilović, Velimir, Krstajic, N. V., Vracar, L. J., "Synthesis, characterization and electrocatalytical behavior of Nb-TiO2/Pt nanocatalyst for oxygen reduction reaction" in Journal of Power Sources, 195, no. 13 (2010):3961-3968,
https://doi.org/10.1016/j.jpowsour.2010.01.035 . .

TY  - JOUR
AU  - Gojković, Snežana Lj.
AU  - Babić, Biljana M.
AU  - Radmilovíć, Velimir R.
AU  - Krstajic, N. V.
PY  - 2010
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3924
AB  - TiO2 doped by 0.5% Nb was synthesized by the acid-catalyzed sol-gel method. BET surface area was determined to be 72 m(2) g(-1). XRD measurements showed that TiO2 has structure of anatase with similar to 13 nm average crystallite size. Using Nb-TiO2 as a support, Pt/Nb-TiO2 and Pt-Ru/Nb-TiO2 were prepared by borohydride reduction method. TEM imaging of Pt-Ru/Nb-TiO2 revealed rather uniform distribution of the metallic particles on the support with a mean diameter of 3.8 nm. According to XRD analysis, Pt-Ru particles consist of the solid solution of Ru in Pt (40 at.% Ru) and a small amount of RuO2. Cyclic voltammetry of Pt/Nb-TiO2 and Pt-Ru/Nb-TiO2 indicated good conductivity of the supporting material. Oxidation of pre-adsorbed CO and methanol on Pt-Ru/Nb-TiO2 was faster than on Pt/Nb-TiO2. However, when the activities of Pt/Nb-TiO2 and Pt-Ru/Nb-TiO2 for methanol oxidation were compared to those of Pt/XC-72 and Pt-Ru/XC-72, no significant difference was observed. This means that Nb-TiO2 is a promising replacement for high area carbon supports in PEMFC anodes, but without the influence on the reaction kinetics. (C) 2009 Elsevier B.V. All rights reserved.
T2  - Journal of Electroanalytical Chemistry
T1  - Nb-doped TiO2 as a support of Pt and Pt-Ru anode catalyst for PEMFCs
VL  - 639
IS  - 1-2
SP  - 161
EP  - 166
DO  - 10.1016/j.jelechem.2009.12.004
ER  - 

@article{
author = "Gojković, Snežana Lj. and Babić, Biljana M. and Radmilovíć, Velimir R. and Krstajic, N. V.",
year = "2010",
abstract = "TiO2 doped by 0.5% Nb was synthesized by the acid-catalyzed sol-gel method. BET surface area was determined to be 72 m(2) g(-1). XRD measurements showed that TiO2 has structure of anatase with similar to 13 nm average crystallite size. Using Nb-TiO2 as a support, Pt/Nb-TiO2 and Pt-Ru/Nb-TiO2 were prepared by borohydride reduction method. TEM imaging of Pt-Ru/Nb-TiO2 revealed rather uniform distribution of the metallic particles on the support with a mean diameter of 3.8 nm. According to XRD analysis, Pt-Ru particles consist of the solid solution of Ru in Pt (40 at.% Ru) and a small amount of RuO2. Cyclic voltammetry of Pt/Nb-TiO2 and Pt-Ru/Nb-TiO2 indicated good conductivity of the supporting material. Oxidation of pre-adsorbed CO and methanol on Pt-Ru/Nb-TiO2 was faster than on Pt/Nb-TiO2. However, when the activities of Pt/Nb-TiO2 and Pt-Ru/Nb-TiO2 for methanol oxidation were compared to those of Pt/XC-72 and Pt-Ru/XC-72, no significant difference was observed. This means that Nb-TiO2 is a promising replacement for high area carbon supports in PEMFC anodes, but without the influence on the reaction kinetics. (C) 2009 Elsevier B.V. All rights reserved.",
journal = "Journal of Electroanalytical Chemistry",
title = "Nb-doped TiO2 as a support of Pt and Pt-Ru anode catalyst for PEMFCs",
volume = "639",
number = "1-2",
pages = "161-166",
doi = "10.1016/j.jelechem.2009.12.004"
}

Gojković, S. Lj., Babić, B. M., Radmilovíć, V. R.,& Krstajic, N. V.. (2010). Nb-doped TiO2 as a support of Pt and Pt-Ru anode catalyst for PEMFCs. in Journal of Electroanalytical Chemistry, 639(1-2), 161-166.
https://doi.org/10.1016/j.jelechem.2009.12.004

Gojković SL, Babić BM, Radmilovíć VR, Krstajic NV. Nb-doped TiO2 as a support of Pt and Pt-Ru anode catalyst for PEMFCs. in Journal of Electroanalytical Chemistry. 2010;639(1-2):161-166.
doi:10.1016/j.jelechem.2009.12.004 .

Gojković, Snežana Lj., Babić, Biljana M., Radmilovíć, Velimir R., Krstajic, N. V., "Nb-doped TiO2 as a support of Pt and Pt-Ru anode catalyst for PEMFCs" in Journal of Electroanalytical Chemistry, 639, no. 1-2 (2010):161-166,
https://doi.org/10.1016/j.jelechem.2009.12.004 . .

TY  - JOUR
AU  - Babić, Biljana M.
AU  - Gulicovski, Jelena J.
AU  - Gajic-Krstajic, Lj.
AU  - Elezovic, N.
AU  - Radmilovíć, Velimir R.
AU  - Krstajic, N. V.
AU  - Vracar, Lj. M.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3731
AB  - The kinetics and mechanism of the hydrogen oxidation reaction were studied in 0.5 mol dm(-3) HClO(4) solution on an electrode based on titanium oxide with Magneli phase structure-supported platinum electrocatalyst applied on rotation Au disk electrode. Pt catalyst was prepared by impregnation method from 2-propanol solution of Pt(NH(3))(2)(NO(2))(2) and sub-stoichiometric titanium oxide powder. Sub-stiochiometric titanium oxide Support was characterized by X-ray diffraction and BET techniques. The synthesized catalyst was analyzed by TEM technique. Based on Tafel-Heyrovsky-Volmer mechanism the corresponding kinetic equations were derived to describe the hydrogen oxidation current-potential behavior on RDE over the entire potential region. The polarization RIDE curves were fitted with derived polarization equations according to proposed model. The fitting shows that the HOR on Pt proceeds most likely via the Tafel-Volmer (TV) pathway in the lower potential region, while the Heyrovsky-Volmer (HV) pathway is operative in the higher potential region. It is pointed out that Tafel equation that has been frequently used for the kinetics analysis in the HOR, can not reproduce the polarization curves measured with high mass-transport rates. Polarization measurements on RDE revealed that the Pt catalyst deposited on titanium suboxide support showed equal specific activity for the HOR compared to conventional carbon-supported Pt fuel cell catalyst. (C) 2008 Elsevier B.V. All rights reserved.
T2  - Journal of Power Sources
T1  - Kinetic study of the hydrogen oxidation reaction on sub-stoichiometric titanium oxide-supported platinum electrocatalyst in acid solution
VL  - 193
IS  - 1
SP  - 99
EP  - 106
DO  - 10.1016/j.jpowsour.2008.11.142
ER  - 

@article{
author = "Babić, Biljana M. and Gulicovski, Jelena J. and Gajic-Krstajic, Lj. and Elezovic, N. and Radmilovíć, Velimir R. and Krstajic, N. V. and Vracar, Lj. M.",
year = "2009",
abstract = "The kinetics and mechanism of the hydrogen oxidation reaction were studied in 0.5 mol dm(-3) HClO(4) solution on an electrode based on titanium oxide with Magneli phase structure-supported platinum electrocatalyst applied on rotation Au disk electrode. Pt catalyst was prepared by impregnation method from 2-propanol solution of Pt(NH(3))(2)(NO(2))(2) and sub-stoichiometric titanium oxide powder. Sub-stiochiometric titanium oxide Support was characterized by X-ray diffraction and BET techniques. The synthesized catalyst was analyzed by TEM technique. Based on Tafel-Heyrovsky-Volmer mechanism the corresponding kinetic equations were derived to describe the hydrogen oxidation current-potential behavior on RDE over the entire potential region. The polarization RIDE curves were fitted with derived polarization equations according to proposed model. The fitting shows that the HOR on Pt proceeds most likely via the Tafel-Volmer (TV) pathway in the lower potential region, while the Heyrovsky-Volmer (HV) pathway is operative in the higher potential region. It is pointed out that Tafel equation that has been frequently used for the kinetics analysis in the HOR, can not reproduce the polarization curves measured with high mass-transport rates. Polarization measurements on RDE revealed that the Pt catalyst deposited on titanium suboxide support showed equal specific activity for the HOR compared to conventional carbon-supported Pt fuel cell catalyst. (C) 2008 Elsevier B.V. All rights reserved.",
journal = "Journal of Power Sources",
title = "Kinetic study of the hydrogen oxidation reaction on sub-stoichiometric titanium oxide-supported platinum electrocatalyst in acid solution",
volume = "193",
number = "1",
pages = "99-106",
doi = "10.1016/j.jpowsour.2008.11.142"
}

Babić, B. M., Gulicovski, J. J., Gajic-Krstajic, Lj., Elezovic, N., Radmilovíć, V. R., Krstajic, N. V.,& Vracar, Lj. M.. (2009). Kinetic study of the hydrogen oxidation reaction on sub-stoichiometric titanium oxide-supported platinum electrocatalyst in acid solution. in Journal of Power Sources, 193(1), 99-106.
https://doi.org/10.1016/j.jpowsour.2008.11.142

Babić BM, Gulicovski JJ, Gajic-Krstajic L, Elezovic N, Radmilovíć VR, Krstajic NV, Vracar LM. Kinetic study of the hydrogen oxidation reaction on sub-stoichiometric titanium oxide-supported platinum electrocatalyst in acid solution. in Journal of Power Sources. 2009;193(1):99-106.
doi:10.1016/j.jpowsour.2008.11.142 .

Babić, Biljana M., Gulicovski, Jelena J., Gajic-Krstajic, Lj., Elezovic, N., Radmilovíć, Velimir R., Krstajic, N. V., Vracar, Lj. M., "Kinetic study of the hydrogen oxidation reaction on sub-stoichiometric titanium oxide-supported platinum electrocatalyst in acid solution" in Journal of Power Sources, 193, no. 1 (2009):99-106,
https://doi.org/10.1016/j.jpowsour.2008.11.142 . .

TY  - JOUR
AU  - Elezovic, N. R.
AU  - Babić, Biljana M.
AU  - Radmilovíć, Velimir R.
AU  - Vracar, Lj. M.
AU  - Krstajic, N. V.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6791
AB  - The oxygen reduction reaction (ORR) was studied at carbon supported MoOx-Pt/C and TiOx-Pt nanocatalysts in 0.5 mol dm(-3) HClO4 solution, at 25 degrees C. The MoOx-Pt/C and TiOx-Pt/C catalysts were prepared by the polyole method combined by MoOx or TiOx post-deposition. Home made catalysts were characterized by TEM and EDX techniques. It was found that catalyst nanoparticles were homogenously distributed over the carbon support with a mean particle size about 2.5 nm. Quite similar distribution and particle size was previously obtained for Pt/C catalyst. Results confirmed that MoOx and TiOx post-deposition did not lead to a significant growth of the Pt nanoparticles. The ORR kinetics was investigated by cyclic voltammetry and linear sweep voltammetry at the rotating disc electrode. These results showed the existence of two E - logj regions, usually observed with polycrystalline Pt in acid solution. It was proposed that the main path in the ORR mechanism on MoOx-Pt/C and TiOx-Pt/C catalysts was the direct four-electron process with the transfer of the first electron as the rate-determining step. The increase in catalytic activity for ORR on MoOx-Pt/C and TiOx-Pt/C catalysts, in comparison with Pt/C catalyst, was explained by synergetic effects due to the formation of the interface between the platinum and oxide materials and by spillover due to the surface diffusion of oxygen reaction intermediates. (C) 2008 Elsevier Ltd. All rights reserved.
T2  - Electrochimica Acta
T1  - Synthesis and characterization of MoOx-Pt/C and TiOx-Pt/C nano-catalysts for oxygen reduction
VL  - 54
IS  - 9
SP  - 2404
EP  - 2409
DO  - 10.1016/j.electacta.2008.03.015
ER  - 

@article{
author = "Elezovic, N. R. and Babić, Biljana M. and Radmilovíć, Velimir R. and Vracar, Lj. M. and Krstajic, N. V.",
year = "2009",
abstract = "The oxygen reduction reaction (ORR) was studied at carbon supported MoOx-Pt/C and TiOx-Pt nanocatalysts in 0.5 mol dm(-3) HClO4 solution, at 25 degrees C. The MoOx-Pt/C and TiOx-Pt/C catalysts were prepared by the polyole method combined by MoOx or TiOx post-deposition. Home made catalysts were characterized by TEM and EDX techniques. It was found that catalyst nanoparticles were homogenously distributed over the carbon support with a mean particle size about 2.5 nm. Quite similar distribution and particle size was previously obtained for Pt/C catalyst. Results confirmed that MoOx and TiOx post-deposition did not lead to a significant growth of the Pt nanoparticles. The ORR kinetics was investigated by cyclic voltammetry and linear sweep voltammetry at the rotating disc electrode. These results showed the existence of two E - logj regions, usually observed with polycrystalline Pt in acid solution. It was proposed that the main path in the ORR mechanism on MoOx-Pt/C and TiOx-Pt/C catalysts was the direct four-electron process with the transfer of the first electron as the rate-determining step. The increase in catalytic activity for ORR on MoOx-Pt/C and TiOx-Pt/C catalysts, in comparison with Pt/C catalyst, was explained by synergetic effects due to the formation of the interface between the platinum and oxide materials and by spillover due to the surface diffusion of oxygen reaction intermediates. (C) 2008 Elsevier Ltd. All rights reserved.",
journal = "Electrochimica Acta",
title = "Synthesis and characterization of MoOx-Pt/C and TiOx-Pt/C nano-catalysts for oxygen reduction",
volume = "54",
number = "9",
pages = "2404-2409",
doi = "10.1016/j.electacta.2008.03.015"
}

Elezovic, N. R., Babić, B. M., Radmilovíć, V. R., Vracar, Lj. M.,& Krstajic, N. V.. (2009). Synthesis and characterization of MoOx-Pt/C and TiOx-Pt/C nano-catalysts for oxygen reduction. in Electrochimica Acta, 54(9), 2404-2409.
https://doi.org/10.1016/j.electacta.2008.03.015

Elezovic NR, Babić BM, Radmilovíć VR, Vracar LM, Krstajic NV. Synthesis and characterization of MoOx-Pt/C and TiOx-Pt/C nano-catalysts for oxygen reduction. in Electrochimica Acta. 2009;54(9):2404-2409.
doi:10.1016/j.electacta.2008.03.015 .

Elezovic, N. R., Babić, Biljana M., Radmilovíć, Velimir R., Vracar, Lj. M., Krstajic, N. V., "Synthesis and characterization of MoOx-Pt/C and TiOx-Pt/C nano-catalysts for oxygen reduction" in Electrochimica Acta, 54, no. 9 (2009):2404-2409,
https://doi.org/10.1016/j.electacta.2008.03.015 . .

TY  - JOUR
AU  - Elezovic, N. R.
AU  - Babić, Biljana M.
AU  - Vracar, Lj. M.
AU  - Radmilovíć, Velimir R.
AU  - Krstajic, N. V.
PY  - 2009
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3730
AB  - The hydrogen oxidation reaction (HOR) was studied at the home made TiOx-Pt/C nanocatalysts in 0.5 mol dm(-3) HClO4 at 25 degrees C. Pt/C catalyst was first synthesized by modified ethylene glycol method (EG) on commercially used carbon support (Vulcan XC-72). Then TiOx-Pt/C catalyst was prepared by the polyole method followed by TiOx post-deposition. The synthesized catalyst was characterized by XRD, TEM and EDX techniques. It was found that Pt/C catalyst nanoparticles were homogenously distributed over carbon support with the mean particle size of about 2.4 nm. The quite similar, homogenous distribution and particle size were obtained for Pt/C doped by TiOx catalyst which was the confirmation that TiOx post-deposition did not lead to significant growth of the Pt nanoparticles. The electrochemically active surface area of the catalyst was determined by using the cyclic voltammetry technique. The kinetics of hydrogen oxidation was investigated by the linear sweep voltammetry technique at the rotating disc electrode (RDE). The kinetic equations used for the analysis were derived considering the reversible or irreversible nature of the kinetics of the HOR. It was found that the hydrogen oxidation reaction for an investigated catalyst proceeded as an electrochemically reversible reaction. The values determined for the kinetic parameters-Tafel slope of 28 mV dec(-1) and exchange current density about 0.4 mA cm(Pt)(-2) are in good agreement with usually reported values for a hydrogen oxidation reaction with platinum catalysts in acid solutions.
T2  - Physical Chemistry Chemical Physics
T1  - Preparation and characterization TiOx-Pt/C catalyst for hydrogen oxidation reaction
VL  - 11
IS  - 25
SP  - 5192
EP  - 5197
DO  - 10.1039/b822249e
ER  - 

@article{
author = "Elezovic, N. R. and Babić, Biljana M. and Vracar, Lj. M. and Radmilovíć, Velimir R. and Krstajic, N. V.",
year = "2009",
abstract = "The hydrogen oxidation reaction (HOR) was studied at the home made TiOx-Pt/C nanocatalysts in 0.5 mol dm(-3) HClO4 at 25 degrees C. Pt/C catalyst was first synthesized by modified ethylene glycol method (EG) on commercially used carbon support (Vulcan XC-72). Then TiOx-Pt/C catalyst was prepared by the polyole method followed by TiOx post-deposition. The synthesized catalyst was characterized by XRD, TEM and EDX techniques. It was found that Pt/C catalyst nanoparticles were homogenously distributed over carbon support with the mean particle size of about 2.4 nm. The quite similar, homogenous distribution and particle size were obtained for Pt/C doped by TiOx catalyst which was the confirmation that TiOx post-deposition did not lead to significant growth of the Pt nanoparticles. The electrochemically active surface area of the catalyst was determined by using the cyclic voltammetry technique. The kinetics of hydrogen oxidation was investigated by the linear sweep voltammetry technique at the rotating disc electrode (RDE). The kinetic equations used for the analysis were derived considering the reversible or irreversible nature of the kinetics of the HOR. It was found that the hydrogen oxidation reaction for an investigated catalyst proceeded as an electrochemically reversible reaction. The values determined for the kinetic parameters-Tafel slope of 28 mV dec(-1) and exchange current density about 0.4 mA cm(Pt)(-2) are in good agreement with usually reported values for a hydrogen oxidation reaction with platinum catalysts in acid solutions.",
journal = "Physical Chemistry Chemical Physics",
title = "Preparation and characterization TiOx-Pt/C catalyst for hydrogen oxidation reaction",
volume = "11",
number = "25",
pages = "5192-5197",
doi = "10.1039/b822249e"
}

Elezovic, N. R., Babić, B. M., Vracar, Lj. M., Radmilovíć, V. R.,& Krstajic, N. V.. (2009). Preparation and characterization TiOx-Pt/C catalyst for hydrogen oxidation reaction. in Physical Chemistry Chemical Physics, 11(25), 5192-5197.
https://doi.org/10.1039/b822249e

Elezovic NR, Babić BM, Vracar LM, Radmilovíć VR, Krstajic NV. Preparation and characterization TiOx-Pt/C catalyst for hydrogen oxidation reaction. in Physical Chemistry Chemical Physics. 2009;11(25):5192-5197.
doi:10.1039/b822249e .

Elezovic, N. R., Babić, Biljana M., Vracar, Lj. M., Radmilovíć, Velimir R., Krstajic, N. V., "Preparation and characterization TiOx-Pt/C catalyst for hydrogen oxidation reaction" in Physical Chemistry Chemical Physics, 11, no. 25 (2009):5192-5197,
https://doi.org/10.1039/b822249e . .

TY  - JOUR
AU  - Elezovic, N. R.
AU  - Babić, Biljana M.
AU  - Radmilovíć, Velimir R.
AU  - Gojković, Snežana Lj.
AU  - Krstajic, N. V.
AU  - Vracar, Lj. M.
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3351
AB  - The oxidation of methanol and reduction of oxygen were studied on MoOx-Pt/C nano-catalysts prepared by the polyole method combined by MoOx post-deposition. The catalysts were characterized by TEM and EDX. The presented composition of the electrode is very similar to the nominal ones and post-deposited MoOx species block only a small fraction of the active Pt particle surface area. MoOx deposition on the carbon support can be ruled out from the EDX results and the low mobility of these oxides at corresponding conditions. The electrode catalytic activity in the electrooxidation of methanol and the reduction of oxygen was studied by steady-state voltammetry and cyclic voltammetry. MoOx-Pt/C catalyst exhibits higher catalytic activity than Pt/C for the oxygen reduction. The catalytic effect in oxidation of methanol is achieved only under potentiodynamic conditions, when poisoning species have no enough time to develop fully. (C) 2007 Elsevier B.V. All rights reserved.
T2  - Journal of Power Sources
T1  - Pt/C doped by MoOx as the electrocatalyst for oxygen reduction and methanol oxidation
VL  - 175
IS  - 1
SP  - 250
EP  - 255
DO  - 10.1016/j.jpowsour.2007.09.011
ER  - 

@article{
author = "Elezovic, N. R. and Babić, Biljana M. and Radmilovíć, Velimir R. and Gojković, Snežana Lj. and Krstajic, N. V. and Vracar, Lj. M.",
year = "2008",
abstract = "The oxidation of methanol and reduction of oxygen were studied on MoOx-Pt/C nano-catalysts prepared by the polyole method combined by MoOx post-deposition. The catalysts were characterized by TEM and EDX. The presented composition of the electrode is very similar to the nominal ones and post-deposited MoOx species block only a small fraction of the active Pt particle surface area. MoOx deposition on the carbon support can be ruled out from the EDX results and the low mobility of these oxides at corresponding conditions. The electrode catalytic activity in the electrooxidation of methanol and the reduction of oxygen was studied by steady-state voltammetry and cyclic voltammetry. MoOx-Pt/C catalyst exhibits higher catalytic activity than Pt/C for the oxygen reduction. The catalytic effect in oxidation of methanol is achieved only under potentiodynamic conditions, when poisoning species have no enough time to develop fully. (C) 2007 Elsevier B.V. All rights reserved.",
journal = "Journal of Power Sources",
title = "Pt/C doped by MoOx as the electrocatalyst for oxygen reduction and methanol oxidation",
volume = "175",
number = "1",
pages = "250-255",
doi = "10.1016/j.jpowsour.2007.09.011"
}

Elezovic, N. R., Babić, B. M., Radmilovíć, V. R., Gojković, S. Lj., Krstajic, N. V.,& Vracar, Lj. M.. (2008). Pt/C doped by MoOx as the electrocatalyst for oxygen reduction and methanol oxidation. in Journal of Power Sources, 175(1), 250-255.
https://doi.org/10.1016/j.jpowsour.2007.09.011

Elezovic NR, Babić BM, Radmilovíć VR, Gojković SL, Krstajic NV, Vracar LM. Pt/C doped by MoOx as the electrocatalyst for oxygen reduction and methanol oxidation. in Journal of Power Sources. 2008;175(1):250-255.
doi:10.1016/j.jpowsour.2007.09.011 .

Elezovic, N. R., Babić, Biljana M., Radmilovíć, Velimir R., Gojković, Snežana Lj., Krstajic, N. V., Vracar, Lj. M., "Pt/C doped by MoOx as the electrocatalyst for oxygen reduction and methanol oxidation" in Journal of Power Sources, 175, no. 1 (2008):250-255,
https://doi.org/10.1016/j.jpowsour.2007.09.011 . .

TY  - JOUR
AU  - Elezovic, N. R.
AU  - Babić, Biljana M.
AU  - Vracar, L. J. M.
AU  - Krstajic, N. V.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3227
AB  - The oxygen reduction reaction was investigated in 0.1 M NaOH solution, on a porous coated electrode formed of Pt particles supported on carbon cryogel. The Pt/C catalyst was characterized by the X-ray diffraction (XRD), transmission electron microscopy (TEM) and cyclic voltammetry techniques. The results demonstrated a successful reduction of Pt to metallic form and homogenous Pt particle size distribution with a mean particle size of about 2.7 nm. The ORR kinetics was investigated by linear sweep polarization at a rotating disc electrode. The results showed the existence of two E - log j regions, usually referred to polycrystalline Pt in acid and alkaline solution. At low Current densities (led), the Tafel slope was found to be close to -2.3RT/F, while at high current densities (bed) it was found to be close to -2x2.3RT/F. It is proposed that the main path in the ORR mechanism on Pt particles was the direct four-electron process, with the transfer of the first electron as the rate determining step. If the activities are expressed through the specific current densities, a small enhancement of the catalytic activity for Pt/C was observed compared to that of polycrystalline Pt. The effect of the Pt particle size on the electrocatalysis of oxygen reduction was ascribed to the predominant (111) facets of the platinum crystallites.
T2  - Journal of the Serbian Chemical Society
T1  - Oxygen reduction at platinum nanoparticles supported on carbon cryogel in alkaline solution
VL  - 72
IS  - 7
SP  - 699
EP  - 708
DO  - 10.2298/JSC0707699E
ER  - 

@article{
author = "Elezovic, N. R. and Babić, Biljana M. and Vracar, L. J. M. and Krstajic, N. V.",
year = "2007",
abstract = "The oxygen reduction reaction was investigated in 0.1 M NaOH solution, on a porous coated electrode formed of Pt particles supported on carbon cryogel. The Pt/C catalyst was characterized by the X-ray diffraction (XRD), transmission electron microscopy (TEM) and cyclic voltammetry techniques. The results demonstrated a successful reduction of Pt to metallic form and homogenous Pt particle size distribution with a mean particle size of about 2.7 nm. The ORR kinetics was investigated by linear sweep polarization at a rotating disc electrode. The results showed the existence of two E - log j regions, usually referred to polycrystalline Pt in acid and alkaline solution. At low Current densities (led), the Tafel slope was found to be close to -2.3RT/F, while at high current densities (bed) it was found to be close to -2x2.3RT/F. It is proposed that the main path in the ORR mechanism on Pt particles was the direct four-electron process, with the transfer of the first electron as the rate determining step. If the activities are expressed through the specific current densities, a small enhancement of the catalytic activity for Pt/C was observed compared to that of polycrystalline Pt. The effect of the Pt particle size on the electrocatalysis of oxygen reduction was ascribed to the predominant (111) facets of the platinum crystallites.",
journal = "Journal of the Serbian Chemical Society",
title = "Oxygen reduction at platinum nanoparticles supported on carbon cryogel in alkaline solution",
volume = "72",
number = "7",
pages = "699-708",
doi = "10.2298/JSC0707699E"
}

Elezovic, N. R., Babić, B. M., Vracar, L. J. M.,& Krstajic, N. V.. (2007). Oxygen reduction at platinum nanoparticles supported on carbon cryogel in alkaline solution. in Journal of the Serbian Chemical Society, 72(7), 699-708.
https://doi.org/10.2298/JSC0707699E

Elezovic NR, Babić BM, Vracar LJM, Krstajic NV. Oxygen reduction at platinum nanoparticles supported on carbon cryogel in alkaline solution. in Journal of the Serbian Chemical Society. 2007;72(7):699-708.
doi:10.2298/JSC0707699E .

Elezovic, N. R., Babić, Biljana M., Vracar, L. J. M., Krstajic, N. V., "Oxygen reduction at platinum nanoparticles supported on carbon cryogel in alkaline solution" in Journal of the Serbian Chemical Society, 72, no. 7 (2007):699-708,
https://doi.org/10.2298/JSC0707699E . .

TY  - JOUR
AU  - Elezovic, N. R.
AU  - Babić, Biljana M.
AU  - Krstajic, N. V.
AU  - Gajic-Krstajic, L. M.
AU  - Vracar, Lj. M.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3285
AB  - Home-made carbon cryogel synthesized by sol-gel polycondensation and freeze-drying is used as support for preparation of highly dispersed Pt catalyst that is made by a modified polyol synthesis method in an ethylene glycol (EG) solution. Specific surface area of carbon support and Pt/C catalyst is determined from nitrogen adsorption isotherm. The adsorption isotherm demonstrates a significant mesoporosity of carbon support. Specific surface area of the carbon support, calculated by the BET equation, is found to be 573 m(2) g(-1). X-ray diffraction (XRD) results demonstrate a successful reduction of the Pt precursor to its metallic form, and transmission electron microscopy (TEM) images show very uniform Pt particle size distribution with mean particle size of about 2.7 +/- 0.7 nm of the catalyst. Potentiodynamic studies of the underpotential deposition of hydrogen (H-upd) on Pt/C electrode in 0.5 mol dm(-3) HClO4 aqueous solution in the temperature range from 274 to 318 K are made, and thermodynamic state functions for the hydrogen adsorption are determined. The experimental results are analyzed assuming linear variation of the Gibbs energy of adsorption versus theta H-upd on the basis of the surface heterogeneity. The increase of Delta G(Hupd)(theta) with the surface coverage indicates the repulsive interactions between H-upd adatoms. From the temperature dependence of the Gibbs energy of adsorption, the enthalpy and the entropy of adsorption are calculated. The values of these functions are determined to be Delta H-Hupd(theta=0) = -5.6 kJ mol(-1) and Delta S-Hupd(theta=0) = 69.1 J mol(-1) K-1 The value of Delta H-Hupd(theta) allows determinations of the bond energy between electrode surface and H-upd that is found to be Ept-H = 223 kJ mol(-1) for theta = 0. (c) 2006 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
T2  - International Journal of Hydrogen Energy
T1  - Specificity of the UPD of H to the structure of highly dispersed Pt on carbon support
VL  - 32
IS  - 12
SP  - 1991
EP  - 1998
DO  - 10.1016/j.ijhydene.2006.09.042
ER  - 

@article{
author = "Elezovic, N. R. and Babić, Biljana M. and Krstajic, N. V. and Gajic-Krstajic, L. M. and Vracar, Lj. M.",
year = "2007",
abstract = "Home-made carbon cryogel synthesized by sol-gel polycondensation and freeze-drying is used as support for preparation of highly dispersed Pt catalyst that is made by a modified polyol synthesis method in an ethylene glycol (EG) solution. Specific surface area of carbon support and Pt/C catalyst is determined from nitrogen adsorption isotherm. The adsorption isotherm demonstrates a significant mesoporosity of carbon support. Specific surface area of the carbon support, calculated by the BET equation, is found to be 573 m(2) g(-1). X-ray diffraction (XRD) results demonstrate a successful reduction of the Pt precursor to its metallic form, and transmission electron microscopy (TEM) images show very uniform Pt particle size distribution with mean particle size of about 2.7 +/- 0.7 nm of the catalyst. Potentiodynamic studies of the underpotential deposition of hydrogen (H-upd) on Pt/C electrode in 0.5 mol dm(-3) HClO4 aqueous solution in the temperature range from 274 to 318 K are made, and thermodynamic state functions for the hydrogen adsorption are determined. The experimental results are analyzed assuming linear variation of the Gibbs energy of adsorption versus theta H-upd on the basis of the surface heterogeneity. The increase of Delta G(Hupd)(theta) with the surface coverage indicates the repulsive interactions between H-upd adatoms. From the temperature dependence of the Gibbs energy of adsorption, the enthalpy and the entropy of adsorption are calculated. The values of these functions are determined to be Delta H-Hupd(theta=0) = -5.6 kJ mol(-1) and Delta S-Hupd(theta=0) = 69.1 J mol(-1) K-1 The value of Delta H-Hupd(theta) allows determinations of the bond energy between electrode surface and H-upd that is found to be Ept-H = 223 kJ mol(-1) for theta = 0. (c) 2006 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.",
journal = "International Journal of Hydrogen Energy",
title = "Specificity of the UPD of H to the structure of highly dispersed Pt on carbon support",
volume = "32",
number = "12",
pages = "1991-1998",
doi = "10.1016/j.ijhydene.2006.09.042"
}

Elezovic, N. R., Babić, B. M., Krstajic, N. V., Gajic-Krstajic, L. M.,& Vracar, Lj. M.. (2007). Specificity of the UPD of H to the structure of highly dispersed Pt on carbon support. in International Journal of Hydrogen Energy, 32(12), 1991-1998.
https://doi.org/10.1016/j.ijhydene.2006.09.042

Elezovic NR, Babić BM, Krstajic NV, Gajic-Krstajic LM, Vracar LM. Specificity of the UPD of H to the structure of highly dispersed Pt on carbon support. in International Journal of Hydrogen Energy. 2007;32(12):1991-1998.
doi:10.1016/j.ijhydene.2006.09.042 .

Elezovic, N. R., Babić, Biljana M., Krstajic, N. V., Gajic-Krstajic, L. M., Vracar, Lj. M., "Specificity of the UPD of H to the structure of highly dispersed Pt on carbon support" in International Journal of Hydrogen Energy, 32, no. 12 (2007):1991-1998,
https://doi.org/10.1016/j.ijhydene.2006.09.042 . .