CATHODE FOR USE IN ELECTROCHEMICAL PROCESSES IN CELL WITH IONEXCHANGE MEMBRANE, ESPECIALLY FOR ELECTROCHEMICAL CELL FOR ELECTROLYSIS OF ALKALI-CHLORIDE AND METHOD FOR PREPARING THE CATHODE

摘要

PCT No. PCT/EP86/00213 Sec. 371 Date Oct. 30, 1986 Sec. 102(e) Date Oct. 30, 1986 PCT Filed Apr. 11, 1986 PCT Pub. No. WO86/06108 PCT Pub. Date Oct. 23, 1986.The present invention concerns electrodes for use in electrochemical processes, particularly as cathodes for hydrogen evolution in cells for the electrolysis of alkali metal halides, the electrodes comprising an electrocatalytic ceramic coating obtained by thermal deposition. Elements of the groups IB, IIB, IIIA, IVA, VA, V B; VI A; VI B and VIII are added to the solutions or dispersion of precursor compounds of electrocatalytic ceramic materials, the solutions or dispersions being thermally decomposed to obtain the coating. The surface of the doped coating thus obtained is substantially immune to poisoning by metal impurities, when the electrode according to the present invention is used as cathode in poisoned alkali solutions.