Effect of Anions on the Kinetics of Tris(1,10-phenanthroline)-cobalt(II)/(III) Redox-Electrode Reaction on a Platinum (111) Single Crystal Electrode

  • WAKABAYASHI Noriaki
    Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
  • KITAMURA Fusao
    Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
  • OHSAKA Takeo
    Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
  • TOKUDA Koichi
    Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology

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Other Title
  • Effect of Anions on the Kinetics of Tris 1 10 phenanthroline cobalt 2 3 Redox-Electrode Reaction on a Platinum 111 Single Crystal Electrode

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Abstract

<p>The redox-electrode reaction of Co(II)(phen)3/Co(III)(phen)3 (phen = 1,10-phenanthroline) in potassium halide solutions was kinetically studied on a Pt(111) single crystal electrode. The formal rate constants were found to depend on the anions and to decrease in the order: F > Cl > Br. It was found that modification of the electrode surface with a monolayer of thiocyanate ion accelerates the heterogeneous electron-transfer reaction, whereas the reaction was retarded by the modification with iodide. These findings are discussed based on the adsorption of anions.</p>

Journal

  • Electrochemistry

    Electrochemistry 67 (12), 1181-1183, 1999-12-05

    The Electrochemical Society of Japan

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