The surface oxide as a source of oxygen on Rh(111)

Edvin Lundgren, Johan Gustafson, Andrea Resta, Jonas Weissenrieder, Anders Mikkelsen, Jesper N Andersen, L Kohler, G Kresse, J Klikovits, A Biederman, M Schmid, P Varga

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58 Citations (SciVal)

Abstract

The reduction of a thin surface oxide on the Rh(1 1 1) surface by CO is studied in situ by photoemission spectroscopy, scanning tunneling microscopy, and density functional theory. CO molecules are found not to adsorb on the surface oxide at a sample temperature of 100 K, in contrast to on the clean and chemisorbed oxygen covered surface. Despite this behavior, the surface oxide may still be reduced by CO, albeit in a significantly different fashion as compared to the reduction of a phase containing only chemisorbed on surface oxygen. The experimental observations combined with theoretical considerations concerning the stability of the surface oxide, result in a model of the reduction process at these pressures suggesting that the surface oxide behaves as a source of oxygen for the CO-oxidation reaction.
Original languageEnglish
Pages (from-to)367-372
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume144-147
DOIs
Publication statusPublished - 2005

Subject classification (UKÄ)

  • Atom and Molecular Physics and Optics

Keywords

  • O
  • Rh
  • STM
  • PES
  • DFR
  • CO

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