Journal
ELECTROCHIMICA ACTA
Volume 53, Issue 21, Pages 6104-6110Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2008.03.046
Keywords
CO adsorption/oxidation; terrace and step edges sites; surface diffusion of CO; non-hydrogen bonded water; ATR-FTIRAS
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ATR-FTIRAS measurements combined with linear potential sweep voltammetry were conducted to perform detailed analysis of CO adsorption/oxidation processes on a chemically deposited Pt film on Si ATR prism. Roles of terrace and step edge sites were clearly demonstrated based on the band analyses of the atop, CO(L), and bridge bonded CO, CO(B), spectra during the adsorption/oxidation processes. In the main current peak region above 0.45 V, a direct spectroscopic evidence was obtained to show oxidation of CO(L) and its diffusion to the step edge sites, where local coverage of CO(L) and CO(B) increases between 0.5 V and 0.64 V. This triggers further oxidation of the overall CO adlayer. (C) 2008 Elsevier Ltd. All rights reserved.
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