Permelec Electrode Ltd.

Hiroshi Asano

Takayuki Shimamune

Kazuhiro Hirao

Hideo Nitta

Toshiki Goto

Ryuta Hirayama

Masashi Hosonuma

Yukiei Matsumoto

A method for the manufacture of an electrode by a thermal treatment of a liquid composition containing an electrode component metal, where the electrode is produced in a high yield and high ratio of retention of the component metal, in which a liquid composition containing an electrode component metal and an organic compound as a ligand capable of forming a complex with a metal ion of the electrode component metal is heat treated.

Method for manufacture of electrode

An electrolytic electrode which exhibits high durability when used in electrochemical processes in which the generation of oxygen is involved and a process for the production of the same. The electrolytic electrode comprises

Durable electrode for electrolysis and process for production thereof

A method for electrolyzing a dilute caustic alkali aqueous solution in an electrolytic cell partitioned by a cation exchange membrane using iron, nickel or their base alloys as an electrode, and an apparatus thereof whereby the polarities of the electrodes are periodically reversed.

Method for electrolyzing dilute caustic alkali aqueous solution by

A cathode for electrolyzing acid solutions which comprises an electrically conductive metal substrate, a spray coated layer of a cathode active material containing tungsten, tungsten carbide or a mixture thereof in an amount of 10% by weight or more on the substrate, and an impregnation coated layer of 1 g/m.sup.2 or more of an acid-resistant fluorine containing resin on the outside surface of the coated layer of cathode active material, and a process for producing such.

Cathode for electrolyzing acid solutions and process for producing the

An electrode comprising a substrate of a conducting metal, a coat of an electrode active substrate, and a layer interposed between the substrate and the coat to serve as a protective barrier for the substrate acquires improved durability by using, as the intermediate layer, a layer having platinum dispersed in a mixed oxide consisting of an oxide of at least one metal selected from the group consisting of titanium and tin, each having a valence of 4, and an oxide of at least one metal selected from the group consisting of tantalum and niobium, each having a valence of 5. The electrode of improved durability is produced by a process which comprises the steps of preparing a substrate of a conducting metal, depositing a solution containing salts of Ti and/or Sn, Ta and/or Nb, and Pt on the substrate, heating the resultant coated substrate under the blanket of an oxidizing gas thereby forming an intermediate layer on the substrate, and subsequently coating the intermediate layer with a layer of an electrode active substance.

A process for the production of electrolytic ion exchange membranes with a coating, comprising coarsening the surface of an ion exchange membrane by an ion-etching treatment and, thereafter, coating the coarsened surface with a substance with a low electrochemical activity. The use of these ion exchange membranes greatly reduces the electrolytic voltage while maintaining a high current efficiency, and enables electrolysis to be performed in a stable manner over a long period of time.

Process for the production of ion exchange membranes with coating for

An electrolysis apparatus comprising a diaphragm of a solid polymer electrolyte, and an anode electrode structure and a cathode electrode structure located on both sides of the diaphragm, at least one of the electrode structures intimately contacting the surface of said diaphragm, the intimately contacting electrode structure comprising a gas-permeable electrically conductive substrate and a film-like porous electrode catalyst layer bonded integrally thereto and a method for producing such.

Electrolysis apparatus using a diaphragm of a solid polymer electrolyte,

An electrolytic electrode which exhibits high durability when used in electrolysis in which the generation of oxygen is involved and a process for the production of same. The electrolytic electrode comprises (a) an electrode substrate of an electrically-conductive metal; (b) an electrode coating of an electrode active substance; and (c) an intermediate layer provided between the electrode substrate and the electrode coating, said intermediate layer comprising a mixed oxide of (i) an oxide of Ti and/or Sn having a valence number of 4 and (ii) an oxide of Ta and/or Nb having a valence number of 5.

Electrolytic electrodes having high durability

Durable electrode for electrolysis

A cathode for use in the electrolysis of acid solutions, comprising

Cathode for electrolysis of acid solution and process for the production

Process for production of electrolytic electrode having high durability

An electrolytic electrode having high durability for use in electrolysis where the generation of oxygen occurs, and a process for the production of the electrolytic electrode, the electrolytic electrode comprising: (a) an electrode substrate of titanium or a titanium-based alloy; (b) an electrode coating of a metal oxide; and (c) an intermediate layer comprising an electrically conductive oxide of tantalum and/or niobium, provided between the electrode substrate (a) and the electrode coating (b), in a thickness calculated as the metal, of 0.001 to 2 g/m.sup.2.

Growing community of inventors

Chiba, Japan

Hiroshi Asano