Study of platinum electrodes by means of electrochemistry and low-energy electron diffraction: Part II. Comparison of the electrochemical activity of Pt(100) and Pt(111) surfaces |
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| Authors: | Arthur T Hubbard Roy M Ishikawa James Katekaru |
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| Institution: | Department of Chemistry, University of California, Santa Barbara, Calif. 93106 (U.S.A.);Hawaii Independent Refinery, Inc., 91-325 Komohana Street, Ewa Beach, Hawaii 96706 (U.S.A.);Department of Chemistry, California State Polytechnic University, San Luis Obispo, Calif. 93407, USA |
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| Abstract: | Low-energy electron diffraction patterns were obtained for Pt(100), Pt(111) and polycrystalline electrodes before and after exposure to aqueous 1 M H2SO4. Linear potential scan voltammograms were recorded. The results demonstrate that one of the principal peaks in the hydrogen region of the current-potential curves of polycrystalline Pt is assignable to Pt(100) and the other to Pt(111). The maximum amount of chemisorbed hydrogen corresponds to one hydrogen atom per surface Pt atom. The Pt(100)1×1], Pt(111) and polycrystalline surfaces appear to withstand prolonged voltammetric characterization at potentials between ?0.2 and 1.2 V vs. a calomel reference. Variation of the voltammetric characteristics of hydrogen chemisorption with changes in the nature of the supporting electrolyte anion are described. |
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| Keywords: | To whom correspondence should be addressed |
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