Electronic And Structural Study Of Pt-modified Au Vicinal Surfaces: A Model System For Pt-au Catalysts

dc.creatorPrieto M.J.
dc.creatorCarbonio E.A.
dc.creatorFatayer S.
dc.creatorLanders R.
dc.creatorDe Siervo A.
dc.date2014
dc.date2015-06-25T17:52:12Z
dc.date2015-11-26T14:15:03Z
dc.date2015-06-25T17:52:12Z
dc.date2015-11-26T14:15:03Z
dc.date.accessioned2018-03-28T21:15:54Z
dc.date.available2018-03-28T21:15:54Z
dc.identifier
dc.identifierPhysical Chemistry Chemical Physics. Royal Society Of Chemistry, v. 16, n. 26, p. 13329 - 13339, 2014.
dc.identifier14639076
dc.identifier10.1039/c4cp01448k
dc.identifierhttp://www.scopus.com/inward/record.url?eid=2-s2.0-84902449326&partnerID=40&md5=5efa69d88b3b74eea6fd9d559baf6940
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/86240
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/86240
dc.identifier2-s2.0-84902449326
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1242686
dc.descriptionTwo single crystalline surfaces of Au vicinal to the (111) plane were modified with Pt and studied using scanning tunneling microscopy (STM) and X-ray photoemission spectroscopy (XPS) in ultra-high vacuum environment. The vicinal surfaces studied are Au(332) and Au(887) and different Pt coverage (θPt) were deposited on each surface. From STM images we determine that Pt deposits on both surfaces as nanoislands with heights ranging from 1 ML to 3 ML depending on θPt. On both surfaces the early growth of Pt ad-islands occurs at the lower part of the step edge, with Pt ad-atoms being incorporated into the steps in some cases. XPS results indicate that partial alloying of Pt occurs at the interface at room temperature and at all coverage, as suggested by the negative chemical shift of Pt 4f core line, indicating an upward shift of the d-band center of the alloyed Pt. Also, the existence of a segregated Pt phase especially at higher coverage is detected by XPS. Sample annealing indicates that the temperature rise promotes a further incorporation of Pt atoms into the Au substrate as supported by STM and XPS results. Additionally, the catalytic activity of different PtAu systems reported in the literature for some electrochemical reactions is discussed considering our findings. © 2014 The Owner Societies.
dc.description16
dc.description26
dc.description13329
dc.description13339
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dc.languageen
dc.publisherRoyal Society of Chemistry
dc.relationPhysical Chemistry Chemical Physics
dc.rightsaberto
dc.sourceScopus
dc.titleElectronic And Structural Study Of Pt-modified Au Vicinal Surfaces: A Model System For Pt-au Catalysts
dc.typeArtículos de revistas


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