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Publicação:
Effects of Alloyed and Oxide Phases on Methanol Oxidation of Pt-Ru/C Nanocatalysts of the Same Particle Size

dc.contributor.authorGodoi, Denis Ricardo Martins de [UNESP]
dc.contributor.authorPerez, Joelma [UNESP]
dc.contributor.authorVillullas, Hebe de Las Mercedes [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T14:18:34Z
dc.date.available2014-05-20T14:18:34Z
dc.date.issued2009-05-14
dc.description.abstractIn this work, methanol oxidation was studied on carbon-supported Pt-Ru nanocatalysts, where the amounts of alloyed and oxide phases were modified by heat treatments in different atmospheres. Because particle growth was avoided using, mild temperature conditions, the study reported here was conducted in the absence of particle size effects. All samples were characterized by X-ray diffraction and transmission electron microscopy. The general electrochemical behavior of the nanocatalysts was evaluated by cyclic voltammetry, and the electrocatalytic activity for the oxidation of methanol was studied in 0.5 mol L(-1) methanol acid solutions by linear potential sweeps and chronoamperometry. The results obtained clearly evidence that the presence of oxide species is necessary to enhance the electrocatalytic activity for methanol oxidation. Oxidation of adsorbed CO was also measured. Both reactions, methanol and adsorbed CO oxidation, were found to be very sensitive to the surface changes produced by the heat treatments. Interestingly, the best catalyst for methanol oxidation was not found to be the most efficient for the oxidation of adsorbed CO. Electrocatalytic activities correlate well with oxidation states and electronic properties analyzed by X-ray photoelectron spectroscopy and in situ dispersive X-ray absorption spectroscopy.en
dc.description.affiliationUniv Estadual Paulista, UNESP, Inst Quim, Dept Quim Fis, BR-14801970 Araraquara, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, UNESP, Inst Quim, Dept Quim Fis, BR-14801970 Araraquara, Brazil
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.description.sponsorshipIdFAPESP: 07/54434-0
dc.description.sponsorshipIdCNPq: 480662/2007-0
dc.description.sponsorshipIdFINEP: 01.06.0939.00
dc.description.sponsorshipIdFAPESP: 06/60769-2
dc.description.sponsorshipIdCNPq: 382986/2007-5
dc.format.extent8518-8525
dc.identifierhttp://dx.doi.org/10.1021/jp8108804
dc.identifier.citationJournal of Physical Chemistry C. Washington: Amer Chemical Soc, v. 113, n. 19, p. 8518-8525, 2009.
dc.identifier.doi10.1021/jp8108804
dc.identifier.issn1932-7447
dc.identifier.lattes0967996519065806
dc.identifier.urihttp://hdl.handle.net/11449/25599
dc.identifier.wosWOS:000265895500078
dc.language.isoeng
dc.publisherAmer Chemical Soc
dc.relation.ispartofJournal of Physical Chemistry C
dc.relation.ispartofjcr4.484
dc.relation.ispartofsjr2,135
dc.rights.accessRightsAcesso restritopt
dc.sourceWeb of Science
dc.titleEffects of Alloyed and Oxide Phases on Methanol Oxidation of Pt-Ru/C Nanocatalysts of the Same Particle Sizeen
dc.typeArtigopt
dcterms.licensehttp://pubs.acs.org/page/copyright/journals/faqs.html
dcterms.rightsHolderAmer Chemical Soc
dspace.entity.typePublication
relation.isOrgUnitOfPublicationbc74a1ce-4c4c-4dad-8378-83962d76c4fd
relation.isOrgUnitOfPublication.latestForDiscoverybc74a1ce-4c4c-4dad-8378-83962d76c4fd
unesp.author.lattes0967996519065806
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Química, Araraquarapt
unesp.departmentFísico-Química - IQARpt

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