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REVIEW ARTICLE When seeing is not believing: Oxygen on Ag,,111..., a simple

When seeing is not believing: Oxygen on Ag,,111..., a simple
adsorption system?
Angelos Michaelides,a
Karsten Reuter, and Matthias Scheffler
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
Received 21 July 2005; accepted 1 August 2005; published 14 October 2005
A number of recent studies indicate that, under the oxygen rich conditions of oxidation catalysis,
some transition metal catalysts may be covered by thin oxide overlayers. Moreover, it has been
suggested that such "surface-oxide" layers are catalytically active, possibly more active than the
pure metal surfaces as was traditionally assumed. This contemporary picture can be traced back to
Ag catalysis, where over 30 years ago it was suggested that the top layer of Ag 111 reconstructed
to an epitaxial Ag2O like overlayer upon exposure to oxygen Rovida et al., Surf. Sci. 43, 230
1974 . Extensive experimental work, including scanning tunneling microscopy studies in which
the oxide was apparently imaged with atomic resolution, as well as density-functional theory
calculations, largely confirmed this interpretation. However, a review of published experimental
data and new density-functional theory results presented here indicate that previous conclusions are
significantly incomplete and that the structure of this original surface oxide must be reconsidered.
2005 American Vacuum Society. DOI: 10.1116/1.2049302


Source: Alavi, Ali - Department of Chemistry, University of Cambridge


Collections: Chemistry