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dc.creatorObradović, Maja
dc.creatorGrgur, Branimir
dc.creatorVračar, Ljiljana M.
dc.date.accessioned2021-03-10T10:11:05Z
dc.date.available2021-03-10T10:11:05Z
dc.date.issued2004
dc.identifier.issn0255-5476
dc.identifier.urihttp://TechnoRep.tmf.bg.ac.rs/handle/123456789/596
dc.description.abstractOxygen reduction (OR) at a Pt3Co alloy electrode has been examined in alkaline solutions of different pH's in the temperature range from 274 to 313 K. At all temperatures, two distinct E-log j rep-ions are observed. At low current densities (cd), Tafel slopes are close to -2.3 RT/F while at high current densities they are close to -2 x 2.3RT/F. The Tafel slopes at all pH values closely follow the kconventional temperature dependence with beta = 1/2. In addition, to confirm the mechanism in the two cd regions, the apparent enthalpies of activation at the selected potentials are calculated in both low and high cd regions at different pH. Although the relation DeltaH(a,J c.d)* gt DeltaH(a,h .c.d)(not equal) was found to be valid. it is concluded that at every pH, at the zero Galvani potential difference, the enthalples of activation are identical, and the rate determining step of OR reaction is the same in both cd regions. The changes in the Tafel slopes arise from different adsorption conditions of reaction intermediates in these regions as previously suggested [1].en
dc.publisherProgress in Advanced Materials and Processes: Proceedings of the Fifth Jugoslav Materials Research Society, YUCOMAT V
dc.rightsrestrictedAccess
dc.sourceMaterials Science Forum
dc.subjectenthalpy of activationen
dc.subjectoxygen reductionen
dc.subjectPt-Co alloyen
dc.subjectreaction mechanismen
dc.titleApparent enthalpies of activation for oxygen reduction at Pt3Co electrode in alkaline solutionen
dc.typearticle
dc.rights.licenseARR
dc.citation.epage114
dc.citation.other453-454: 109-114
dc.citation.rankM23
dc.citation.spage109
dc.citation.volume453-454
dc.identifier.pmid
dc.identifier.rcubhttps://hdl.handle.net/21.15107/rcub_technorep_596
dc.identifier.scopus2-s2.0-3142763964
dc.identifier.wos000221535700020
dc.type.versionpublishedVersion


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