Method of filling the pore chambers of metallic or surface metallized scaffolding with metal oxides or Metal hydroxides and application of the process

摘要

917,291. Electrolyte processes; electric batteries. KANDLER, L. Sept. 1, 1959 [Sept. 3, 1958], No. 29867/59. Classes 41 and 53. A metal oxide or hydroxide is introduced into a porous, electrically conductive structure by electrolysing, with the structure as cathode, an acid electrolyte containing ions of the metal of which the oxide or hydroxide is to be produced, and reducible ions with a redox potential more positive than the discharge potential of the metal ions. The reducible ions may be nitrate, chlorate or permanganate. Electrodes for primary cells and accumulators of the alkaline-electrolyte type may be so prepared; in examples, a porous sintered nickel electrode was made the cathode in an aqueous acid solution of nickel nitrate with a nickel anode, divalent nickel hydroxide being deposited, the electrode then being made the anode in an alkaline solution to oxidize the hydroxide to the trivalent hydroxide; and a sintered nickel or iron electrode was made the cathode in an acid solution of cadmium nitrate with a cadmium anode, cadmium hydroxide being deposited, the electrode then being made the cathode in an alkaline electrolyte to reduce the hydroxide to metal.