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.

Original languageEnglish (US)
Pages (from-to)14879-14884
Number of pages6
JournalJournal of the American Chemical Society
Volume131
Issue number41
DOIs
StatePublished - Oct 21 2009

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Electrocatalysis
Stress measurement
Surface measurement
Carbon Monoxide
Observation
Oxidation
Electrolytes
Adsorption
Electrodes
Electrooxidation
Voltammetry

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Direct observation of bifunctional electrocatalysis during CO oxidation at Ruθ=0.37/Pt{111} surfaces via surface stress measurements. / Mickelson, Larry L.; Friesen, Cody.

In: Journal of the American Chemical Society, Vol. 131, No. 41, 21.10.2009, p. 14879-14884.

Research output: Contribution to journalArticle

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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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