XPS study of the state of iridium, platinum, titanium and oxygen in thermally formed IrO2+TiO2+PtOx films

dc.creatorda Silva, LA
dc.creatorAlves, VA
dc.creatorde Castro, SC
dc.creatorBoodts, JFC
dc.date2000
dc.dateSEP 30
dc.date2014-12-02T16:27:09Z
dc.date2015-11-26T16:27:32Z
dc.date2014-12-02T16:27:09Z
dc.date2015-11-26T16:27:32Z
dc.date.accessioned2018-03-28T23:08:29Z
dc.date.available2018-03-28T23:08:29Z
dc.identifierColloids And Surfaces A-physicochemical And Engineering Aspects. Elsevier Science Bv, v. 170, n. 41700, n. 119, n. 126, 2000.
dc.identifier0927-7757
dc.identifierWOS:000087888300004
dc.identifier10.1016/S0927-7757(99)00535-X
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/72944
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/72944
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/72944
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1269215
dc.descriptionElectrodes of nominal composition Ir0.3Ti(0.7-x)PtxO2 (x = 0; 0.4 and 0.7) have been prepared by thermal decomposition of mixtures of the chloride precursors. H2PtCl6 was used as Pt-precursor. A systematic study of the chemical composition and oxidation states of the elements of these electrodes was performed by XPS. XPS analysis showed that the surface of the PtOx-containing coatings are Pt enriched. Additionally, XPS revealed that the Ir signals are almost absent from the spectra of PtOx-containing electrodes, while the Ti signal is completely absent. On the basis of the XPS results it is possible to propose a model of the surface structure of these electrodes: the grains, composed almost exclusively of Ir Jr Pt, are Pt enriched and distributed in a matrix, which although having Ti in its composition, besides Ir and Pt, is also Pt enriched. This finding corroborates the electrochemical behaviour of these electrodes, which is characteristic of polycrystalline Pt. (C) 2000 Elsevier Science B.V. All rights reserved.
dc.description170
dc.description41700
dc.description119
dc.description126
dc.languageen
dc.publisherElsevier Science Bv
dc.publisherAmsterdam
dc.publisherHolanda
dc.relationColloids And Surfaces A-physicochemical And Engineering Aspects
dc.relationColloid Surf. A-Physicochem. Eng. Asp.
dc.rightsfechado
dc.rightshttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dc.sourceWeb of Science
dc.subjectXPS
dc.subjectmixed oxides
dc.subjectelectrocatalysts
dc.subjectplatinum
dc.subjectiridium
dc.subjecttitanium
dc.subjectMixed-oxide Electrodes
dc.subjectElectrocatalytic Activity
dc.subjectSurface Characterization
dc.subjectChlorine Evolution
dc.subjectAlkaline-solution
dc.subjectRuthenium
dc.subjectAlloys
dc.subjectMetals
dc.subjectIro2
dc.subjectUhv
dc.titleXPS study of the state of iridium, platinum, titanium and oxygen in thermally formed IrO2+TiO2+PtOx films
dc.typeArtículos de revistas


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