Durable electrode coatings

C - Chemistry – Metallurgy – 25 – B

Patent

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Details

C25B 11/06 (2006.01) C23C 18/16 (2006.01) C23C 18/18 (2006.01) C23C 18/31 (2006.01) C25B 11/03 (2006.01) C25B 11/04 (2006.01)

Patent

CA 2257456

Durable electrolytic cell electrodes having low hydrogen overpotential and performance stability. A highly porous electrocatalytic primary phase and an outer, secondary phase reinforcement coating are provided on an electrically conducting transition metal substrate to make the electrodes. Durability is achieved by the application of the outer secondary phase to protect the primary phase electrocatalytically active coating. A process is also disclosed for catalizing a substrate surface to promote electroless deposition of a metal.

La présente invention concerne des électrodes durables de cellules électrolytiques, lesquelles électrodes sont caractérisées par une faible surtension en hydrogène et un rendement stable. Pour faire ces électrodes, on dépose sur un substrat électroconducteur en métal de transition un revêtement de renfort de phase primaire électrocatalytique hautement poreux et un revêtement de renfort de phase secondaire extérieure. La durabilité obtenue résulte de l'application de la phase secondaire externe en protection du revêtement électrolytiquement actif de la phase primaire. L'invention concerne également un procédé d'activation d'une surface de substrat visant à favoriser le dépôt non électrolytique d'un métal.

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