TY  - JOUR
AU  - Elezovic, Nevenka R.
AU  - Babić, Biljana M.
AU  - Radmilović, Velimir
AU  - Gajic-Krstajic, Ljiljana M.
AU  - Krstajic, Nedeljko V.
AU  - Vracar, Ljiljana M.
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4475
AB  - The kinetics of the hydrogen oxidation reaction (HOR) was studied at Pt nanoparticles supported on niobia-doped titania (Pt/N-T). The catalyst support, with the composition of 0.05NbO(2.5-delta)-0.995TiO(2) (0 LT delta LT 1), was synthesized by a modified sol gel procedure and characterized by the BET and X-ray diffraction (XRD) techniques. The specific surface area of the support was found to be 70 m(2) g(-1). The XRD analysis revealed the presence of the anatase TiO(2) phase in the support powder. No peaks indicating the existence of Nb-compounds were detected. Pt/N-T nanocatalyst was synthesized by the borohydride reduction method. Transmission electron microscopy revealed a quite homogenous distribution of the Pt nanoparticles over the support, with a mean particle size of about 3 nm. The electrochemical active surface area of Pt of 42 +/- 14 m(2) g(-1) was determined by the cyclic voltammetry technique. The kinetics of the HOR was investigated by linear sweep voltammetry at a rotating disc electrode in 0.5 mol dm(-3) HClO(4) solution. The determined value of the Tafel slope of 35 mV dec(-1) and an exchange current density of 0.45 mA cm(-2) per real surface area of the Pt are in good accordance with those already reported in the literature for the HOR at polycrystalline Pt and Pt nanocatalysts in acid solutions. This new catalyst exhibited better activity for the HOR in comparison with Pt nanocatalyst supported on Vulcan (R) XC-72R high area carbon.
T2  - Journal of the Serbian Chemical Society
T1  - A novel platinum-based nanocatalyst at a niobia-doped titania support for the hydrogen oxidation reaction
VL  - 76
IS  - 8
SP  - 1139
EP  - 1152
DO  - 10.2298/JSC100823100E
ER  - 

@article{
author = "Elezovic, Nevenka R. and Babić, Biljana M. and Radmilović, Velimir and Gajic-Krstajic, Ljiljana M. and Krstajic, Nedeljko V. and Vracar, Ljiljana M.",
year = "2011",
abstract = "The kinetics of the hydrogen oxidation reaction (HOR) was studied at Pt nanoparticles supported on niobia-doped titania (Pt/N-T). The catalyst support, with the composition of 0.05NbO(2.5-delta)-0.995TiO(2) (0 LT delta LT 1), was synthesized by a modified sol gel procedure and characterized by the BET and X-ray diffraction (XRD) techniques. The specific surface area of the support was found to be 70 m(2) g(-1). The XRD analysis revealed the presence of the anatase TiO(2) phase in the support powder. No peaks indicating the existence of Nb-compounds were detected. Pt/N-T nanocatalyst was synthesized by the borohydride reduction method. Transmission electron microscopy revealed a quite homogenous distribution of the Pt nanoparticles over the support, with a mean particle size of about 3 nm. The electrochemical active surface area of Pt of 42 +/- 14 m(2) g(-1) was determined by the cyclic voltammetry technique. The kinetics of the HOR was investigated by linear sweep voltammetry at a rotating disc electrode in 0.5 mol dm(-3) HClO(4) solution. The determined value of the Tafel slope of 35 mV dec(-1) and an exchange current density of 0.45 mA cm(-2) per real surface area of the Pt are in good accordance with those already reported in the literature for the HOR at polycrystalline Pt and Pt nanocatalysts in acid solutions. This new catalyst exhibited better activity for the HOR in comparison with Pt nanocatalyst supported on Vulcan (R) XC-72R high area carbon.",
journal = "Journal of the Serbian Chemical Society",
title = "A novel platinum-based nanocatalyst at a niobia-doped titania support for the hydrogen oxidation reaction",
volume = "76",
number = "8",
pages = "1139-1152",
doi = "10.2298/JSC100823100E"
}

Elezovic, N. R., Babić, B. M., Radmilović, V., Gajic-Krstajic, L. M., Krstajic, N. V.,& Vracar, L. M.. (2011). A novel platinum-based nanocatalyst at a niobia-doped titania support for the hydrogen oxidation reaction. in Journal of the Serbian Chemical Society, 76(8), 1139-1152.
https://doi.org/10.2298/JSC100823100E

Elezovic NR, Babić BM, Radmilović V, Gajic-Krstajic LM, Krstajic NV, Vracar LM. A novel platinum-based nanocatalyst at a niobia-doped titania support for the hydrogen oxidation reaction. in Journal of the Serbian Chemical Society. 2011;76(8):1139-1152.
doi:10.2298/JSC100823100E .

Elezovic, Nevenka R., Babić, Biljana M., Radmilović, Velimir, Gajic-Krstajic, Ljiljana M., Krstajic, Nedeljko V., Vracar, Ljiljana M., "A novel platinum-based nanocatalyst at a niobia-doped titania support for the hydrogen oxidation reaction" in Journal of the Serbian Chemical Society, 76, no. 8 (2011):1139-1152,
https://doi.org/10.2298/JSC100823100E . .

TY  - JOUR
AU  - Elezovic, Nevenka R.
AU  - Babić, Biljana M.
AU  - Krstajic, Nedeljko V.
AU  - Gojković, Snežana Lj.
AU  - Vracar, Ljiljana M.
PY  - 2008
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3509
AB  - The temperature dependence of oxygen reduction reaction (ORR) was studied on highly dispersed Pt nanoparticles supported on a carbon cryogel. The specific surface area of the support was 5 17 m(2) g(-1), the Pt particles diameter was about 2.7 nm and the loading of the catalyst was 20 wt. %. The kinetics of the ORR at the Pt/C electrode was examined in 0.50 mol dm(-3) HClO4 solution in the temperature range from 274 to 318 K. At all temperatures, two distinct E-log j regions were observed at low current densities with a slope of -2.3RT/F and at high current densities with a slope of -2.3 x 2RT/F. In order to confirm the mechanism of oxygen reduction previously suggested at a polycrystalline Pt and a Pt/Ebonex nanostructured electrode, the apparent enthalpies of activation at selected potentials vs. the reversible hydrogen electrode were calculated in both current density regions. Although Delta H-a,l(not equal) GT Delta H-a,h(not equal), it was found that the enthalpies of activation at the zero Galvani potential difference were the same and hence it could be concluded that the rate-determining step of the ORR was the same in both current density regions. The synthesized Pt/C catalyst showed a small enhancement in the catalytic activity for ORR in comparison to the polycrystalline Pt, but no change in the mechanism of the reaction.
T2  - Journal of the Serbian Chemical Society
T1  - Temperature dependence of the kinetics of oxygen reduction on carbon-supported Pt nanoparticles
VL  - 73
IS  - 6
SP  - 641
EP  - 654
DO  - 10.2298/JSC0806641E
ER  - 

@article{
author = "Elezovic, Nevenka R. and Babić, Biljana M. and Krstajic, Nedeljko V. and Gojković, Snežana Lj. and Vracar, Ljiljana M.",
year = "2008",
abstract = "The temperature dependence of oxygen reduction reaction (ORR) was studied on highly dispersed Pt nanoparticles supported on a carbon cryogel. The specific surface area of the support was 5 17 m(2) g(-1), the Pt particles diameter was about 2.7 nm and the loading of the catalyst was 20 wt. %. The kinetics of the ORR at the Pt/C electrode was examined in 0.50 mol dm(-3) HClO4 solution in the temperature range from 274 to 318 K. At all temperatures, two distinct E-log j regions were observed at low current densities with a slope of -2.3RT/F and at high current densities with a slope of -2.3 x 2RT/F. In order to confirm the mechanism of oxygen reduction previously suggested at a polycrystalline Pt and a Pt/Ebonex nanostructured electrode, the apparent enthalpies of activation at selected potentials vs. the reversible hydrogen electrode were calculated in both current density regions. Although Delta H-a,l(not equal) GT Delta H-a,h(not equal), it was found that the enthalpies of activation at the zero Galvani potential difference were the same and hence it could be concluded that the rate-determining step of the ORR was the same in both current density regions. The synthesized Pt/C catalyst showed a small enhancement in the catalytic activity for ORR in comparison to the polycrystalline Pt, but no change in the mechanism of the reaction.",
journal = "Journal of the Serbian Chemical Society",
title = "Temperature dependence of the kinetics of oxygen reduction on carbon-supported Pt nanoparticles",
volume = "73",
number = "6",
pages = "641-654",
doi = "10.2298/JSC0806641E"
}

Elezovic, N. R., Babić, B. M., Krstajic, N. V., Gojković, S. Lj.,& Vracar, L. M.. (2008). Temperature dependence of the kinetics of oxygen reduction on carbon-supported Pt nanoparticles. in Journal of the Serbian Chemical Society, 73(6), 641-654.
https://doi.org/10.2298/JSC0806641E

Elezovic NR, Babić BM, Krstajic NV, Gojković SL, Vracar LM. Temperature dependence of the kinetics of oxygen reduction on carbon-supported Pt nanoparticles. in Journal of the Serbian Chemical Society. 2008;73(6):641-654.
doi:10.2298/JSC0806641E .

Elezovic, Nevenka R., Babić, Biljana M., Krstajic, Nedeljko V., Gojković, Snežana Lj., Vracar, Ljiljana M., "Temperature dependence of the kinetics of oxygen reduction on carbon-supported Pt nanoparticles" in Journal of the Serbian Chemical Society, 73, no. 6 (2008):641-654,
https://doi.org/10.2298/JSC0806641E . .

TY  - JOUR
AU  - Babić, Biljana M.
AU  - Kaluđerović, Branka V.
AU  - Vracar, Ljiljana M.
AU  - Radmilović, Velimir
AU  - Krstajic, Nedeljko V.
PY  - 2007
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/3286
AB  - A carbon cryogel, synthesized by carbonization of a resorcinol/formaldehyde cryogel and oxidized in nitric acid, was used as catalyst Support for Pt nanoparticles. The Pt/C catalyst was prepared by a modified polyol synthesis method in an ethylene glycol (EG) solution. Characterization by nitrogen adsorption showed that the carbon cryogel support and the Pt/C catalyst were mesoporous materials with high specific surface areas (S-BET GT 400 m(2) g(-1)) and large mesoporous Volumes. X-Ray diffraction of the catalyst demonstrated the successful reduction of the Pt precursor to metallic form. TEM Images of the Pt/C catalyst and Pt particle size distribution showed that the mean Pt particle size was about 3.3 nm. Cyclic voltammetry (CV) experiments at various scan rates (from 2 to 200 mV s(-1)) were pet-formed in 0.5 mol dm(-3) HCIO4 solution. The large capacitance of the oxidized carbon cryogel electrode, which arises from a combination of the double-layer capacitance and pseudocapacitance, associated with the participation of surface redox-type reactions was demonstrated. For the oxidized carbon cryogel, the total specific capacitance determined by I1/C vs. v(0.5) extrapolation method was found to be 386 F g-l. The hydrogen oxidation reaction at the investigated Pt/C catalyst proceeded as an electrochemically reversible, two-electron direct discharge reaction.
T2  - Journal of the Serbian Chemical Society
T1  - Characterization of a surface modified carbon cryogel and a carbon supported Pt catalyst
VL  - 72
IS  - 8-9
SP  - 773
EP  - 785
DO  - 10.2298/JSC0709773B
ER  - 

@article{
author = "Babić, Biljana M. and Kaluđerović, Branka V. and Vracar, Ljiljana M. and Radmilović, Velimir and Krstajic, Nedeljko V.",
year = "2007",
abstract = "A carbon cryogel, synthesized by carbonization of a resorcinol/formaldehyde cryogel and oxidized in nitric acid, was used as catalyst Support for Pt nanoparticles. The Pt/C catalyst was prepared by a modified polyol synthesis method in an ethylene glycol (EG) solution. Characterization by nitrogen adsorption showed that the carbon cryogel support and the Pt/C catalyst were mesoporous materials with high specific surface areas (S-BET GT 400 m(2) g(-1)) and large mesoporous Volumes. X-Ray diffraction of the catalyst demonstrated the successful reduction of the Pt precursor to metallic form. TEM Images of the Pt/C catalyst and Pt particle size distribution showed that the mean Pt particle size was about 3.3 nm. Cyclic voltammetry (CV) experiments at various scan rates (from 2 to 200 mV s(-1)) were pet-formed in 0.5 mol dm(-3) HCIO4 solution. The large capacitance of the oxidized carbon cryogel electrode, which arises from a combination of the double-layer capacitance and pseudocapacitance, associated with the participation of surface redox-type reactions was demonstrated. For the oxidized carbon cryogel, the total specific capacitance determined by I1/C vs. v(0.5) extrapolation method was found to be 386 F g-l. The hydrogen oxidation reaction at the investigated Pt/C catalyst proceeded as an electrochemically reversible, two-electron direct discharge reaction.",
journal = "Journal of the Serbian Chemical Society",
title = "Characterization of a surface modified carbon cryogel and a carbon supported Pt catalyst",
volume = "72",
number = "8-9",
pages = "773-785",
doi = "10.2298/JSC0709773B"
}

Babić, B. M., Kaluđerović, B. V., Vracar, L. M., Radmilović, V.,& Krstajic, N. V.. (2007). Characterization of a surface modified carbon cryogel and a carbon supported Pt catalyst. in Journal of the Serbian Chemical Society, 72(8-9), 773-785.
https://doi.org/10.2298/JSC0709773B

Babić BM, Kaluđerović BV, Vracar LM, Radmilović V, Krstajic NV. Characterization of a surface modified carbon cryogel and a carbon supported Pt catalyst. in Journal of the Serbian Chemical Society. 2007;72(8-9):773-785.
doi:10.2298/JSC0709773B .

Babić, Biljana M., Kaluđerović, Branka V., Vracar, Ljiljana M., Radmilović, Velimir, Krstajic, Nedeljko V., "Characterization of a surface modified carbon cryogel and a carbon supported Pt catalyst" in Journal of the Serbian Chemical Society, 72, no. 8-9 (2007):773-785,
https://doi.org/10.2298/JSC0709773B . .