Oxygen gas permselective composite membrane and air electrode comprising the same

Abstract

Abstract PURPOSE:To provide an oxygen gas permselective composite membrane enabled in heavy load discharge over a long time even if thin and excellent in preservability, by coating at least one surface of a porous membrane with a metal hydroxide layer, and impregnating the inner wall of each pore with metal hydroxide. CONSTITUTION:A porous membrane having fine pores each having a pore size of, especially, 1mum or less uniformly distributed therein, for example, a porous fluorine contained resin is prepared. In the next step, the porous membrane is immersed in a salt solution capable of forming metal hydroxide (e.g., tin hydroxide) while the treated membrane is immersed in a basic solution to form a membrane comprising metal hydroxide. Subsequently, the whole of the porous membrane having the membrane formed thereto is dried under vacuum. At this time, in removing moisture, it is pref. to heat the whole of the membrane to about 50-100 deg.C under vacuum and the thickness of the obtained membrane layer is pref. 0.1-10mum. A desired air electrode is obtained by coating an electrode main body with the resulting composite membrane. The aforementioned electrode main body has activity for electrochemically reducing O2-gas and a conductive porous body is used as said electrode main body.

Inventors

• 👤 Nobukazu Suzuki
• 👤 鈴木　信和
• 👤 Shinji Tsuruta
• 👤 鶴田　慎司
• 👤 Yuichi Sato
• 👤 祐一 佐藤

Bibliographic Details