アルカリ性溶液中におけるモリブデンの過不働態溶解電位域でのインピーダンス応答

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タイトル別名
  • Impedance Responses of Molybdenum at Transpassive Dissolution Potentials in Alkaline Aqueous Solution
  • アルカリセイ ヨウエキチュウ ニ オケル モリブデン ノ カフドウタイ ヨウカ

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説明

The kinetics of transpassive dissolution of the Mo electrode has been investigated using electrochemical impedance spectroscopy (EIS). Nyquist plots of impedance responses conrresponding to transpassive dissolution of Mo in aqueous alkaline solutions (pH10∼12) show a capacitive loop at −0.4V∼−0.1V vs. SSE and an apparent Warburg impedance above 0 V. A theoretical model is proposed that takes into account the electrochemical reaction at the metal/electrolyte interface and the diffusion of dissolved Mo (VI) ions. The comparison of the theoretical electrochemical impedance with experimental data leads to the conclusion that not only electroshemical reaction at the interface but also diffusion process of dissolved species determine the total reaction rate above 0 V. The surface concentration of Mo (VI) ions calculated by the present theoretical model is more than 102 mol/m3, when the diffusion process influences the electrochemical impedance responses and polarization curves.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 59 (8), 827-832, 1995

    公益社団法人 日本金属学会

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