Temperature dependence of the kinetics of oxygen reduction on carbon-supported Pt nanoparticles
2008
Autori
Elezovic, Nevenka R.Babić, Biljana M.
Krstajic, Nedeljko V.
Gojković, Snežana Lj.
Vracar, Ljiljana M.
Članak u časopisu
Metapodaci
Prikaz svih podataka o dokumentuApstrakt
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 a...t 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.
Ključne reči:
oxygen reduction reaction / platinum catalyst / carbon support / temperature dependence / enthalpy of activationIzvor:
Journal of the Serbian Chemical Society, 2008, 73, 6, 641-654Finansiranje / projekti:
- Ministry of Science of the Republic of Serbia [142038]
DOI: 10.2298/JSC0806641E
ISSN: 0352-5139
WoS: 000258789700005
Scopus: 2-s2.0-47049105414
Kolekcije
Institucija/grupa
VinčaTY - 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 . .