Method for the production of nickel oxide surfaces having...

C - Chemistry – Metallurgy – 25 – B

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C25B 11/04 (2006.01) H01M 4/32 (2006.01) H01M 4/48 (2006.01) H01M 4/52 (2006.01)

Patent

CA 2574170

The invention relates to a method for producing electrically conducting nickel oxide surfaces made of nickel-containing material. According to said method, the nickel surface is first degreased and is then roughened for approximately ten minutes in a solution containing about one percent of hydrochloric acid, said process being accelerated by adding hydrogen peroxide solution, resulting in the electrolyte turning green. The nickel surface is briefly watered, the nickel material is introduced into a solution of 3.5 molar lye to which about ten percent of hydrogen peroxide is added and is kept therein for ten minutes, and the resulting nickel hydroxide surface is dehydrogenated in a subsequent thermal process and is then further oxidized to obtain nickel oxide. The invention further relates to a conductive boundary layer that is produced according the said method, the electrodes therefrom, and the use thereof in chlor-alkali electrolysis processes, in fuel cells and accumulators.

L'invention concerne un procédé servant à produire des surfaces d'oxyde de nickel électroconductrices à partir d'un matériau contenant du nickel. Selon l'invention, la surface de nickel est d'abord dégraissée, puis décapée pendant environ 10 minutes dans une solution d'acide chlorhydrique à environ 1 %, le processus étant accéléré par l'ajout d'une solution de peroxyde d'hydrogène et l'électrolyte prenant une coloration verdâtre. La surface de nickel est alors brièvement mouillée et le matériau à base de nickel est placé dans une solution constituée de lessive alcaline 3,5 molaire, mélangée à environ 10 % de peroxyde d'hydrogène, et y est laissé pendant 10 minutes. La surface d'hydroxyde de nickel ainsi formée est déshydratée lors d'un processus thermique subséquent, puis est oxydée en oxyde de nickel. L'invention concerne également la couche conductrice limite produite selon ce procédé, les électrodes contenant cette couche conductrice limite, ainsi que l'utilisation de ces électrodes dans des procédés d'électrolyse à l'alcali et au chlore, dans des piles à combustible et dans des accumulateurs.

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