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dc.creatorElezović, Nevenka R.
dc.creatorBabić, Biljana M.
dc.creatorKrstajić, Nedeljko V
dc.creatorGojković, Snežana Lj
dc.creatorVračar, Ljiljana M
dc.date.accessioned2022-04-05T14:17:47Z
dc.date.available2022-04-05T14:17:47Z
dc.date.issued2008
dc.identifier.issn0352-5139
dc.identifier.urihttp://rimsi.imsi.bg.ac.rs/handle/123456789/290
dc.description.abstractThe 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) > 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.en
dc.publisherSrpsko hemijsko društvo, Beograd
dc.relationinfo:eu-repo/grantAgreement/MESTD/MPN2006-2010/142038/RS//
dc.rightsopenAccess
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.sourceJournal of the Serbian Chemical Society
dc.subjecttemperature dependenceen
dc.subjectplatinum catalysten
dc.subjectoxygen reduction reactionen
dc.subjectenthalpy of activationen
dc.subjectcarbon supporten
dc.titleTemperature dependence of the kinetics of oxygen reduction on carbon-supported Pt nanoparticlesen
dc.typearticle
dc.rights.licenseBY-NC-ND
dc.citation.epage654
dc.citation.issue6
dc.citation.other73(6): 641-654
dc.citation.rankM23
dc.citation.spage641
dc.citation.volume73
dc.identifier.doi10.2298/JSC0806641E
dc.identifier.fulltexthttp://rimsi.imsi.bg.ac.rs/bitstream/id/547/287.pdf
dc.identifier.scopus2-s2.0-47049105414
dc.identifier.wos000258789700005
dc.type.versionpublishedVersion


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