Direct observation of bifunctional electrocatalysis during CO oxidation at Ruθ=0.37/Pt{111} surfaces via surface stress measurements

Larry L. Mickelson; Cody Friesen

doi:10.1021/ja904432c

Direct observation of bifunctional electrocatalysis during CO oxidation at Ru_θ=0.37/Pt{111} surfaces via surface stress measurements

Larry L. Mickelson, Cody Friesen

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

The surface stress response during the electrooxidation of CO at Pt{111}, Ru{0001}, and Ru_θ=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 OH_ads provided to the Pt surface sites via Ru sites.

Original language	English (US)
Pages (from-to)	14879-14884
Number of pages	6
Journal	Journal of the American Chemical Society
Volume	131
Issue number	41
DOIs	https://doi.org/10.1021/ja904432c
State	Published - Oct 21 2009

ASJC Scopus subject areas

Catalysis
General Chemistry
Biochemistry
Colloid and Surface Chemistry

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title = "Direct observation of bifunctional electrocatalysis during CO oxidation at Ruθ=0.37/Pt{111} surfaces via surface stress measurements",

abstract = "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.",

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AU - Friesen, Cody

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Y1 - 2009/10/21

N2 - 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.

AB - 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.

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Direct observation of bifunctional electrocatalysis during CO oxidation at Ru_θ=0.37/Pt{111} surfaces via surface stress measurements

Abstract

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