The Interaction of Cobalt with CeO2(111) Prepared on Cu(111)

Gábor Vári, László Óvári, Christian Papp, Hans Peter Steinrück, János Kiss, Zoltán Kónya

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Abstract

The interaction of cobalt with an ultrathin CeO2(111) film on Cu(111) was studied by low energy ion scattering spectroscopy and X-ray photoelectron spectroscopy. At room temperature, Co grows three-dimensionally on the ceria film. For small Co coverages (0.2 ML), oxidation to Co2+ occurs together with the formation of Ce3+ in the ceria. At higher Co coverages (0.7 and 2 ML), an increasing fraction of Co remained metallic after deposition. Annealing to higher temperatures induced diffusion of Co2+ ions into the ceria film, and for metallic Co, presumably agglomeration occurs. At T ≥ 800 K, oxidation of significant amounts of Co0 to Co2+ is found, along with diffusion into the ceria film, and partly also in the copper crystal underneath. On a reduced CeOx surface, the redox reaction between cobalt and cerium was hindered, which, in turn, slowed down cobalt migration into the ceria film.

Original languageEnglish
Pages (from-to)9324-9333
Number of pages10
JournalJournal of Physical Chemistry C
Volume119
Issue number17
DOIs
Publication statusPublished - Apr 30 2015

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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