Journal
APPLIED SURFACE SCIENCE
Volume 267, Issue -, Pages 12-16Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2012.04.098
Keywords
Copper; Ceria; Photoemission; DFT plus U
Categories
Funding
- Project HPC-EUROPA [RII3-CT-2003-506079]
- Czech Grant Agency [P204/10/1169, P204/11/1183, 202/09/H041]
- Charles University Grant Agency [103410]
- Ministry of Education of the Czech Republic [LA08022, LG12003]
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Stoichiometric and partially reduced ceria films were deposited on preoxidized Ru(0001) crystal by Ce evaporation in oxygen atmosphere of different pressures at 700 K. Copper-ceria interaction was investigated by deposition of metalic copper on both types of substrate. The samples were characterized by low energy electron diffraction (LEED), X-ray photoelectron spectroscopy (XPS) of core states and resonant photoelectron spectroscopy (RPES) of the valence bands. Copper adsorption on stoichiometric ceria caused reduction of CeO2, while on the oxygen-defficient ceria it partially reoxidized the substrate. This is in agreement with DFT+U calculations of copper adsorption on stoichiometric and defective ceria surfaces. (C) 2012 Elsevier B. V. All rights reserved.
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