Ni (  OH  ) 2 ‐ Impregnated Anodes for Alkaline Water Electrolysis

Porous nickel‐coated oxygen evolution anodes were impregnated with nickel hydroxide by electrochemical precipitation methods. A one‐step process produced superior deposit morphology and control over the loading. The quantity of deposited was a linear function of the charge passed during electrochemical precipitation. Oxygen evolution overpotentials in 30 weight percent at 80°C were about 45–60 mV lower on anodes than on similar uncatalyzed anodes. The maximum overpotential reduction was obtained at low loadings. An overpotential increase at higher loadings was caused by plugging of the coating surface pores by , leading to a decrease in effective surface area.