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  - 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 . .