Tosoh Corporation

Kazuhisa Yamaguchi

Kazumasa Suetsugu

Takashi Sakaki

Kanji Yoshimitsu

Satoshi Yoshida

A novel cathode of low hydrogen overvoltage is provided which is useful for electrolysis of water and electrolysis of an aqueous alkali metal chloride such as sodium chloride. A process for producing the cathode is also provided. The low hydrogen overvoltage cathode comprises an electroconductive base material; and a coating layer containing at least one organic compound selected from the group consisting of amino acids, monocarboxylic acids, dicarboxylic acids, monoamines, diamines, triamines, and tetramines, and derivatives thereof at a content of from 0.5% to 18% by weight in terms of carbon, and a metal component selected from the group consisting of nickel, nickel-iron, nickel-cobalt, and nickel-indium at an indium content ranging from 1% to 90% by weight. The process for producing the low hydrogen overvoltage cathode comprises conducting electrodeposition to form a coating layer on a surface of an electroconductive base material in a plating bath containing at least nickel ions, nickel and iron ions, nickel and cobalt ions, or nickel and indium ions, and containing additionally at least one organic compound selected from the group consisting of amino acids, monocarboxylic acids, dicarboxylic acids, monoamines, diamines, triamines, and tetramines, and derivatives thereof.

Low hydrogen overvoltage cathode and process for production thereof

A low hydrogen overvoltage cathode is provided which comprises an electroconductive base material coated with an alloy layer containing cobalt and tin at least at a content of tin ranging from 0.01 to 95% by weight. A process is also provided for producing the low hydrogen voltage cathode, wherein cobalt and tin at least are electrolytically co-deposited onto a surface of an electroconductive base material from a plating bath containing cobalt ions, tin ions, and a complexing agent.

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Yamaguchi, Japan

Kazuhisa Yamaguchi