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dc.contributor.authorMalheiro, A. R.-
dc.contributor.authorPerez, J.-
dc.contributor.authorVillullas, Hebe de Las Mercedes-
dc.date.accessioned2014-05-20T14:18:32Z-
dc.date.accessioned2016-10-25T17:40:35Z-
dc.date.available2014-05-20T14:18:32Z-
dc.date.available2016-10-25T17:40:35Z-
dc.date.issued2010-05-15-
dc.identifierhttp://dx.doi.org/10.1016/j.jpowsour.2009.11.096-
dc.identifier.citationJournal of Power Sources. Amsterdam: Elsevier B.V., v. 195, n. 10, p. 3111-3118, 2010.-
dc.identifier.issn0378-7753-
dc.identifier.urihttp://hdl.handle.net/11449/25585-
dc.identifier.urihttp://acervodigital.unesp.br/handle/11449/25585-
dc.description.abstractIn this work, physical and catalytic properties of Pt-Fe/C nanocatalysts of nominal compositions Pt;Fe 70:30 and 50:50, prepared by a polyol process using a long-chain diol as reducer (hexadecanediol) and oleic acid and oleylamine as stabilizers, are reported. As-prepared materials have very small particle size (2.2 nm), narrow particle size distribution, and homogeneous dispersion on the carbon support. The average compositions determined by energy dispersive X-ray analysis are Pt(75)Fe(25)/C and Pt(60)Fe(40)/C. Data for samples submitted to heat treatment in hydrogen atmosphere to induce Pt surface segregation are also presented. X-ray diffraction and transmission electronic microscopy are used to examine all as-prepared and heat-treated catalysts. Electronic properties are analyzed based on in situ dispersive X-ray absorption spectroscopy data. Measurements of electrocatalytic activity for oxygen reduction show that all Pt-Fe/C have electrocatalytic activities superior to that of Pt/C. Nanocatalysts with a Pt-rich surface have an enhanced performance for the reduction of oxygen but measurements carried out in methanol containing solutions show that Pt-enriched surfaces have an inferior methanol tolerance. (C) 2009 Elsevier B.V. All rights reserved.en
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)-
dc.description.sponsorshipFinanciadora de Estudos e Projetos (FINEP)-
dc.description.sponsorshipLaboratório Nacional de Luz Síncrotron (LNLS)-
dc.format.extent3111-3118-
dc.language.isoeng-
dc.publisherElsevier B.V.-
dc.sourceWeb of Science-
dc.subjectElectrocatalysten
dc.subjectOxygen reduction reactionen
dc.subjectNanostructured materialsen
dc.subjectPt-based nanoparticlesen
dc.titleSurface structure and electronic properties of Pt-Fe/C nanocatalysts and their relation with catalytic activity for oxygen reductionen
dc.typeoutro-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.description.affiliationUniv Estadual Paulista, Inst Quim, Dept Fisicoquim, BR-14801970 Araraquara, SP, Brazil-
dc.description.affiliationUnespUniv Estadual Paulista, Inst Quim, Dept Fisicoquim, BR-14801970 Araraquara, SP, Brazil-
dc.description.sponsorshipIdFAPESP: 07/54434-0-
dc.description.sponsorshipIdCNPq: 480662/2007-0-
dc.description.sponsorshipIdCNPq: 151917/2008-6-
dc.description.sponsorshipIdFINEP: 01.06.0939.00-
dc.identifier.doi10.1016/j.jpowsour.2009.11.096-
dc.identifier.wosWOS:000275074200010-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofJournal of Power Sources-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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