Amorphous Ni-Ti and Ni-Zr alloys for water electrolysis cathode materials.
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概要
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Amorphous Ni–Ti and Ni–Zr alloys for their possible use in water electrolysis cathode materials were investigated. The hydrogen electrode reaction in 1 M NaOH (1 M= 1 mol dm<SUP>−3</SUP>) proceeds <I>via</I> the Volmer-Tafel reaction route with mixed rate-determining characteristics. The electrocatalytic activity is augmented significantly with a treatment of the alloy electrodes with aq HF. Thus, the exchange current density reaches 10<SUP>−3</SUP>A cm<SUP>−2</SUP> (apparent) at 303 K. The activation energy values are 9.4, 5.5, and 6.1 kcal mol<SUP>−1</SUP> (1 cal=4.184J) for the Volmer and Tafel step and the overall reaction, respectively. Surface analyses of the electrodes have indicated that such a high activity is caused by a stable porous Ni layer which is formed on the surface by the acid treatment. Such a porous Ni layer was not effectively formed if the alloys were in crystalline states.
- 公益社団法人 日本化学会の論文
著者
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Suzuki Kenji
The Research Institute For Iron Steel And Other Metals
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Kai Kenzo
The Research Institue For Iron Steel And Other Metals Tohoku University
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Machida Ken-ichi
Research Institute for Catalysis, Hokkaido University
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Miyahara Koshiro
Research Institute for Catalysis, Hokkaido University
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Enyo Michio
Research Institute for Catalysis, Hokkaido University
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Toyoshima Isamu
Research Institute for Catalysis, Hokkaido University
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Kai Kenzo
The Research Institute for Iron, Steel, and Other Metals, Tohoku University
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