Noble metal-coated cathode
AssigneeOccidental Chemical Corporation
InventorTilak V. Bommaraju
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Abstract
Cathodes comprising a conductive metal substrate, such as a ferrous metal or titanium, having thereon an intermediate protective layer and an overcoating of a mixture of platinum and another noble metal are prepared. These cathodes function in aqueous alkali metal salt solution electrolytic cells or alkali metal halate electrolytic cells to reduce the cathode overvoltage in comparison with conventional ferrous metal electrodes.
Claims4
In a process for producing an alkali metal halate by electrolyzing an alkali metal halide solution in an electrolytic cell having at least one anode and cathode, the improvement which comprises utilizing as said cathode a low overvoltage hydrogen cathode comprising a conductive substrate, an intermediate protective layer selected from the group consisting of silver, cadmium, chromium and tungsten applied to the conductive substrate, and a porous noble metal coating deposited onto at least a portion of the surface of said intermediate protective layer, a major portion of said noble metal layer comprising platinum, and a minor portion of said noble metal layer comprising a second noble metal selected from the group consisting of rhodium, palladium, iridium, and osmium.
Dependencies are inferred from the claim text.