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  - 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  - 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  - 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 . .

TY  - JOUR
AU  - Gajic-Krstajic, Lj. M.
AU  - Trisovic, T. Lj.
AU  - Babić, Biljana M.
AU  - Vracar, Lj. M.
PY  - 2006
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/6607
AB  - The kinetics of oxygen reduction (ORR) on carbon cryogel supported Pt nanoparticles (Pt / C) in acid solution was studied using the rotating disk electrode technique. This electrocatalyst OF was prepared by a modified polyol synthesis method and characterized by transmission electron microscopies. The kinetics of ORR shows a significant enhancement at Pt nanoparticle surfaces as compared with the same reaction on polycrystalline Pt surface. The four-electron reduction, with a first-charge transfer-rate determining step, has been found to be operative. However, the specific activity of the Pt / C is similar to that of the polycrystalline Pt electrocatalyst.
T2  - Materials Science Forum
T1  - Oxygen reduction on carbon cryogel-supported Pt nanoparticles in acid media
VL  - 518
SP  - 289
EP  - 294
DO  - 10.4028/www.scientific.net/MSF.518.289
ER  - 

@article{
author = "Gajic-Krstajic, Lj. M. and Trisovic, T. Lj. and Babić, Biljana M. and Vracar, Lj. M.",
year = "2006",
abstract = "The kinetics of oxygen reduction (ORR) on carbon cryogel supported Pt nanoparticles (Pt / C) in acid solution was studied using the rotating disk electrode technique. This electrocatalyst OF was prepared by a modified polyol synthesis method and characterized by transmission electron microscopies. The kinetics of ORR shows a significant enhancement at Pt nanoparticle surfaces as compared with the same reaction on polycrystalline Pt surface. The four-electron reduction, with a first-charge transfer-rate determining step, has been found to be operative. However, the specific activity of the Pt / C is similar to that of the polycrystalline Pt electrocatalyst.",
journal = "Materials Science Forum",
title = "Oxygen reduction on carbon cryogel-supported Pt nanoparticles in acid media",
volume = "518",
pages = "289-294",
doi = "10.4028/www.scientific.net/MSF.518.289"
}

Gajic-Krstajic, Lj. M., Trisovic, T. Lj., Babić, B. M.,& Vracar, Lj. M.. (2006). Oxygen reduction on carbon cryogel-supported Pt nanoparticles in acid media. in Materials Science Forum, 518, 289-294.
https://doi.org/10.4028/www.scientific.net/MSF.518.289

Gajic-Krstajic LM, Trisovic TL, Babić BM, Vracar LM. Oxygen reduction on carbon cryogel-supported Pt nanoparticles in acid media. in Materials Science Forum. 2006;518:289-294.
doi:10.4028/www.scientific.net/MSF.518.289 .

Gajic-Krstajic, Lj. M., Trisovic, T. Lj., Babić, Biljana M., Vracar, Lj. M., "Oxygen reduction on carbon cryogel-supported Pt nanoparticles in acid media" in Materials Science Forum, 518 (2006):289-294,
https://doi.org/10.4028/www.scientific.net/MSF.518.289 . .