Promoter Effect of Early Stage Grown Surface Oxides: A Near-Ambient-Pressure XPS Study of CO Oxidation on PtSn Bimetallics

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dc.authorid0000-0003-4617-0227
dc.authorid0000-0002-8973-6561
dc.authorid0000-0001-5291-7011
dc.contributor.authorJugnet, Yvette
dc.contributor.authorLoffreda, David
dc.contributor.authorDupont, Celine
dc.contributor.authorDelbecq, Francoise
dc.contributor.authorEhret, Eric
dc.contributor.authorAires, Francisco J. Cadete Santos
dc.contributor.authorLiu, Zhi
dc.date.accessioned2019-08-01T13:38:39Z
dc.date.available2019-08-01T13:38:39Z
dc.date.issued2012
dc.departmentNiğde ÖHÜ
dc.description.abstractThe knowledge of the catalyst active phase on the atomic scale under realistic working conditions is the key for designing new and more efficient materials. In this context, the investigation of CO oxidation on the bimetallic Pt3Sn(111) surfaces by near-ambient-pressure X-ray photoelectron spectroscopy and density functional theory calculations illustrates how combining advanced methodologies allows the determination of the nature of the active phase. Starting from 300 K and 500 mTorr of oxygen, the progressive formation of surface oxides is observed with increasing temperature: SnO, PtO units first, and SnO2, PtO2 units afterward. For CO oxidation on the (2 X 2) surface, the activity gain is assigned to the build-up of ultrathin domains composed of SnO and SnO2 units. The formation of these early stage surface oxides is entirely supported by a density functional theory analysis. More generally, this study demonstrates how the catalyst surface oxidation and transformation can be better controlled by a relevant choice of environmental conditions.
dc.description.sponsorshipOffice of Science, Office of Basic Energy Sciences, U.S. Department of Energy [DE-AC02-05CH11231]; Agence Nationale de la Recherche (ANR) [ANR-08-BLAN-0096-03]
dc.description.sponsorshipThis research was partially carried out at the Advanced Light Source supported by the Director, Office of Science, Office of Basic Energy Sciences, U.S. Department of Energy under contract DE-AC02-05CH11231. Y.J. acknowledges U. Bardi (Firenze University) for providing the Pt<INF>3</INF>Sn(111) sample and the Agence Nationale de la Recherche (ANR) for financial support (ANR-08-BLAN-0096-03). D.L., C.D., and F.D. thank IDRIS, Orsay, CINES, Montpellier and PSMN, Lyon for CPU time and assistance.
dc.identifier.doi10.1021/jz301802g
dc.identifier.endpage3714
dc.identifier.issn1948-7185
dc.identifier.issue24
dc.identifier.pmid26291100
dc.identifier.scopus2-s2.0-84871578502
dc.identifier.scopusqualityQ1
dc.identifier.startpage3707
dc.identifier.urihttps://dx.doi.org/10.1021/jz301802g
dc.identifier.urihttps://hdl.handle.net/11480/4503
dc.identifier.volume3
dc.identifier.wosWOS:000312762900007
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.indekslendigikaynakPubMed
dc.institutionauthor[0-Belirlenecek]
dc.language.isoen
dc.publisherAMER CHEMICAL SOC
dc.relation.ispartofJOURNAL OF PHYSICAL CHEMISTRY LETTERS
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.titlePromoter Effect of Early Stage Grown Surface Oxides: A Near-Ambient-Pressure XPS Study of CO Oxidation on PtSn Bimetallics
dc.typeArticle

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