PRODUCTION OF GOLD-TON EXCHANGE MEMBRANE JOINED BODY

摘要

PROBLEM TO BE SOLVED: To improve conductivity of a gold layer and adhesion property between gold and an exchange membrane by adsorbing a specified compd. of gold on a cation exchange membrane and subjecting the cation exchange membrane to reduction. SOLUTION: First, a gold(III) ethylene diamine complex is subjected to ion exchange adsorption on a cation exchange membrane. In this process, the complex is subjected to ion exchange with cation in the exchange membrane and trapped in the exchange membrane. Then the ion exchange membrane is washed with water and treated with a reducing agent soln. to form a gold catalyst layer. Compared to conventional techniques, this method requires no rigorous control of pH in the reduction reaction and the reduction process can be completed in a short time. When an aq. sol. of ascorbic acid or its salt is used as a reducing agent, the gold layer formed on the surface of the ion exchange membrane is a uniform joined layer having excellent density. Especially, when an ascorbate is used., a gold layer having extremely small surface resistance is obtd. and the obtd. material is suitable for an electrode material.