Oxygen evolution reaction on composite cobalt borides.
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概要
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The Oxygen evolution reaction on cobalt borides and composite cobalt borides was investigated in a 6M KOH solution (1 M=1 mol dm<SUP>−3</SUP>) using the factor of the magnetic properties. In the system of cobalt borides (Co:B=3:1) prepared at various sintering temperatures, the boride having a higher saturation magnetization revealed a higher activity of the oxygen evolution reaction. In the system of composite cobalt borides which have various magnetic moments, μ<SUB>B</SUB>, a clear correlation between the activity of the oxygen evolution reaction and the saturation magnetization (or magnetic moment, μ<SUB>B</SUB>) was observed for several composite cobalt boride species (<I>i.e.</I>, Co–Fe–B, Co–Ni–B, Co–Mn–B, and Co–B). Among the composite cobalt boride species, the cobalt iron boride (Co:Fe:B=1:2:1) sintered at 450 °C showed the highest activity of oxygen evolution reaction in a 6 M KOH solution. The conditions of oxide formation on Co–Fe–B(1:2:1) and on Co–B(3:1) in a 6 M KOH solution were compared with those on cobalt by means of voltammetry and chronopotentiometry. It was concluded that the ease and stability of oxide films in higher oxidation states are strongly correlated to the activity of the oxygen evolution reaction which occurs on more highly oxidized oxide films.
- 公益社団法人 日本化学会の論文
著者
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Osaka Tetsuya
Department Of Applied Chemistry Faculty Of Science And Engineering Waseda University
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Kitayama Hiroshi
Department of Applied Chemistry, School of Science and Engineering, Waseda University
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Iwase Yoshio
Department of Applied Chemistry, School of Science and Engineering, Waseda University
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Ichino Toshihiro
Department of Applied Chemistry, School of Science and Engineering, Waseda University
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