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Unexpected Behavior of the Surface Composition of PtRh Alloys during Chemical Reaction (Articolo in rivista)

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Unexpected Behavior of the Surface Composition of PtRh Alloys during Chemical Reaction (Articolo in rivista) (literal)

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Alternative label

Alessandro Baraldi; Dario Giacomello; Luca Rumiz; Mauro Moretuzzo;Silvano Lizzit;Francesco Buatier de Mongeot;Giorgio Paolucci;Giovanni Comelli;Renzo Rosei;Bernard E. Nieuwenhuys;Ugo Valbusa;Maya P. Kiskinova| (2005)
Unexpected Behavior of the Surface Composition of PtRh Alloys during Chemical Reaction
in Journal of the American Chemical Society (Print); ACS, American chemical society, Washington, DC (Stati Uniti d'America)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Alessandro Baraldi; Dario Giacomello; Luca Rumiz; Mauro Moretuzzo;Silvano Lizzit;Francesco Buatier de Mongeot;Giorgio Paolucci;Giovanni Comelli;Renzo Rosei;Bernard E. Nieuwenhuys;Ugo Valbusa;Maya P. Kiskinova| (literal)

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Dipartimento di Fisica, Universita` di Trieste, Via Valerio 2, 34127 Trieste, Italy, Laboratorio TASC-INFM, S.S. 14 Km 163.5, 34012 Trieste, Italy; CENMATsCenter of Excellence for Nanostructured Materials, Via Valerio 2, 34127, Trieste,Italy; Sincrotrone Trieste S.C.p.A., S.S. 14 Km 163.5, 34012 Trieste, Italy; INFM Unita` di GenoVa and Dipartimento di Fisica, Via Dodecaneso 33, I-16146 GenoVa, Italy; Leiden Institute of Chemistry, Leiden UniVersity, NL-2300 RA Leiden, The Netherlands (literal)

Titolo

Unexpected Behavior of the Surface Composition of PtRh Alloys during Chemical Reaction (literal)

Abstract

The changes in the surface composition of a Pt50Rh50(100) alloy due to an ongoing 2H2 + O2f2H2O chemical reaction have been studied in situ. Exploiting the high-energy resolution and surface sensitivity of synchrotron radiation core-level spectroscopy it was possible to monitor the population of the two transitions metals atoms at the gas-surface interface. Sequences of fast high-resolution core-level spectra of the Rh3d5/2, Pt4f7/2, and O1s core levels showed a continuous exchange of atoms between the first and subsurface layers. An unexpected Pt surface enrichement was found under slightly oxidizing conditions, opposite to what found in a highly oxidizing atmosphere. (literal)

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