Redox behavior of the model catalyst Pd/CeO2-x/Pt(111)

Wilson, E. L., Grau-Crespo, R. ORCID: https://orcid.org/0000-0001-8845-1719, Pang, C. L., Cabailh, G., Chen, Q., Purton, J. A., Catlow, C. R. A., Brown, W. A., de Leeuw, N. H. and Thornton, G. (2008) Redox behavior of the model catalyst Pd/CeO2-x/Pt(111). Journal of Physical Chemistry C, 112 (29). pp. 10918-10922. ISSN 1932-7447 doi: 10.1021/jp8004103

Abstract/Summary

Photoelectron spectroscopy and scanning tunneling microscopy have been used to investigate how the oxidation state of Ce in CeO2-x(111) ultrathin films is influenced by the presence of Pd nanoparticles. Pd induces an increase in the concentration of Ce3+ cations, which is interpreted as charge transfer from Pd to CeO2-x(111) on the basis of DFT+U calculations. Charge transfer from Pd to Ce4+ is found to be energetically favorable even for individual Pd adatoms. These results have implications for our understanding of the redox behavior of ceria-based model catalyst systems.