Electrocatalysis in metal hydride electrode. I. Hydrogen electrode reaction on group-IB and VIII metals deposited on palladium substrates.
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概要
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Hydrogen electrode reactions (HER) on thin-layer electrodes of group-IB and VIII metals (Cu, Ag, Au, Ni, and Pt) prepared by electro-deposition on Pd foil substrates were studied (together with the Pd foil itself) in 0.5 M H<SUB>2</SUB>SO<SUB>4</SUB> and 1.0 M NaOH (M=mol dm<SUP>−3</SUP>) at 303 K by a transient technique. The reactions on these metals were concluded to proceed via a Volmer-Tafel reaction route and the exchange current densities of the elementary steps, <I>i</I><SUB>oV</SUB> and <I>i</I><SUB>oT</SUB>, were then evaluated. The electrocatalytic activities towards the Volmer step were observed to be in the order Pt>Pd>Au>Ag>Cu in an acidic solution and Pt>Pd>Ni≥Ag≥Au≥Cu in an alkaline solution. The activities towards the Tafel step were Pt≥Pd>Au>Cu>Ag in an acidic solution and Pd>Pt>Au>Cu=Ag>Ni in an alkaline solution. The results were summarized in terms of the parameter <I>m</I><SUB>o</SUB> (=<I>i</I><SUB>oV</SUB>⁄<I>i</I><SUB>oT</SUB>). This parameter was used to describe the electrochemistry of the energy efficiency of a hydride-type hydrogen-storage electrode, when the metals were employed for the purpose of modifying the electrode surface. Pt and Ag (among the group-IB metals) in both acidic and alkaline solutions were revealed to be suitable electrocatalysts.
- 公益社団法人 日本化学会の論文
著者
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Machida Ken-ichi
Research Institute for Catalysis, Hokkaido University
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Enyo Michio
Research Institute for Catalysis, Hokkaido University
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