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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/74408
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dc.contributor.authorGasparotto, Luiz H.S.-
dc.contributor.authorCiapina, Eduardo G.-
dc.contributor.authorCantane, Daniel A.-
dc.contributor.authorGomes, Janaina F.-
dc.contributor.authorLima, Fabio H.B.-
dc.contributor.authorTicianelli, Edson A.-
dc.contributor.authorTremiliosi-Filho, Germano-
dc.date.accessioned2014-05-27T11:28:11Z-
dc.date.accessioned2016-10-25T18:42:48Z-
dc.date.available2014-05-27T11:28:11Z-
dc.date.available2016-10-25T18:42:48Z-
dc.date.issued2013-01-22-
dc.identifierhttp://dx.doi.org/10.1016/j.electacta.2012.12.127-
dc.identifier.citationElectrochimica Acta, v. 104, p. 358-366.-
dc.identifier.issn0013-4686-
dc.identifier.urihttp://hdl.handle.net/11449/74408-
dc.identifier.urihttp://acervodigital.unesp.br/handle/11449/74408-
dc.description.abstractIn the present paper we investigated the effect of adsorbed PVA on Pt electrodes on classic electrochemical processes such as hydrogen UPD, oxygen reduction and CO electro-oxidation. Upon adsorption PVA blocks roughly 50% of the hydrogen sites and can not be removed from the Pt surface through cycling in the potential range of 0.05-1.0 V vs. RHE. Potentiodynamic experiments under controlled hydrodynamic conditions provided by rotating disk electrode experiments showed a negative impact of the adsorbed PVA on the oxygen reduction reaction (ORR). Cyclic-voltammetry results revealed that not even CO was able to remove PVA from the Pt surface. Regarding the oxidation of CO, the adsorbed polymer positively shifted the CO oxidation peak potential, therefore higher potentials are required to free the Pt surface from CO poisoning. In situ Fourier transform infrared spectroscopy evidenced that the presence of PVA shifted the linearly bound CO frequency toward higher wavenumbers, a process found to be independent of the Pt surface orientation. In situ electrochemical X-ray absorption spectroscopy results showed that PVA also impacted the electronic properties of platinum by decreasing the occupancy of the Pt conducting 5d band. Our findings clearly support the efforts toward understanding the nature of the interaction between polymers and metallic surfaces as well as the impact on technological applications (e.g. in PEMFCs). © 2013 Elsevier Ltd. All rights reserved.en
dc.format.extent358-366-
dc.language.isoeng-
dc.sourceScopus-
dc.subjectCO electro-oxidation-
dc.subjectIn situ FTIR-
dc.subjectIn situ XAS-
dc.subjectPlatinum-
dc.subjectPVA adsorption-
dc.subjectCO electrooxidation-
dc.subjectHydrodynamic conditions-
dc.subjectIn-situ FT-IR-
dc.subjectIn-situ XAS-
dc.subjectOxygen reduction reaction-
dc.subjectPotentiodynamic experiments-
dc.subjectRotating disk electrodes-
dc.subjectTechnological applications-
dc.subjectAdsorption-
dc.subjectCyclic voltammetry-
dc.subjectElectrolytic reduction-
dc.subjectElectronic properties-
dc.subjectElectrooxidation-
dc.subjectExperiments-
dc.subjectFourier transform infrared spectroscopy-
dc.subjectHydrogen-
dc.subjectPolymers-
dc.subjectPolyvinyl alcohols-
dc.subjectRotating disks-
dc.subjectX ray absorption spectroscopy-
dc.titleAltering the adsorptive and electronic properties of Pt through poly(vinyl alcohol) adsorptionen
dc.typeoutro-
dc.contributor.institutionUniversidade Federal do Rio Grande do Norte (UFRN)-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionUniversidade de São Paulo (USP)-
dc.description.affiliationInstituto de Química Universidade Federal Do Rio Grande Do Norte, Lagoa Nova, 59072-970, Natal, RN-
dc.description.affiliationDepartamento de Física e Química Faculdade de Engenharia de Guaratinguetá Universidade Estadual Paulista Júlio de Mesquita Filho-UNESP, 12516-410 Guaratinguetá, SP-
dc.description.affiliationInstituto de Química de São Carlos Universidade de São Paulo, Caixa Postal 780, 13560-970 São Carlos, SP-
dc.description.affiliationUnespDepartamento de Física e Química Faculdade de Engenharia de Guaratinguetá Universidade Estadual Paulista Júlio de Mesquita Filho-UNESP, 12516-410 Guaratinguetá, SP-
dc.identifier.doi10.1016/j.electacta.2012.12.127-
dc.identifier.wosWOS:000321601200046-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofElectrochimica Acta-
dc.identifier.scopus2-s2.0-84884283663-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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