Direct Observation of Bifunctional Electrocatalysis during CO Oxidation at Ruθ=0.37/Pt{111} Surfaces via Surface Stress Measurements

The surface stress response during the electrooxidation of CO at Pt{111}, Ru{0001}, and Ruθ=0.37/Pt{111} textured electrodes was studied in 0.1 M HClO4 electrolytes. The surface stress signal resolves for the first time the adsorption of OH− at the CO-covered Ru{0001} surface prior to significant CO...

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Bibliographic Details
Published inJournal of the American Chemical Society Vol. 131; no. 41; pp. 14879 - 14884
Main Authors Mickelson, Larry L, Friesen, Cody
Format Journal Article
LanguageEnglish
Published American Chemical Society 21.10.2009
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Summary:The surface stress response during the electrooxidation of CO at Pt{111}, Ru{0001}, and Ruθ=0.37/Pt{111} textured electrodes was studied in 0.1 M HClO4 electrolytes. The surface stress signal resolves for the first time the adsorption of OH− at the CO-covered Ru{0001} surface prior to significant CO oxidation, a phenomenon that is not discernible in the voltammetry. The surface stress signal shows that significant tensile surface stress occurs upon oxidation of the adsorbed CO and occurs at nearly the same potential on Ru{0001} and Ru/Pt{111} surfaces. These observations demonstrate that the mechanism of bifunctionality is the OHads provided to the Pt surface sites via Ru sites.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja904432c