Process for the manufacture of an electrode material containing silver and tungsten carbide
AssigneeSiemens Aktiengesellschaft
InventorKonrad Mund
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Abstract
The invention concerns a method for the manufacture of an electrode material containing silver and tungsten carbide for electrochemical cells, particularly fuel cells and storage cells. Tungsten carbide in powder form is placed in a solution of a tungstate; then silver tungstate is precipitated by adding thereto a silver salt and the silver tungstate in the tungsten carbide-silver tungstate mixture is reduced to silver and tungsten, and subsequently the tungsten is carburized to form tungsten carbide. This abstract is neither intended to define the invention covered by this application, which, of course, is measured by the claims, nor is it intended to be limiting as to the scope of the invention in any way.
Claims8
A process for preparing silver containing tungsten carbide particles adapted for use in manufacturing electrodes for fuel cells, which process comprises forming a suspension of finely-divided particles of tungsten carbide in an aqueous solution of a tungstate, adding to said suspension a solution of a silver salt, thereby forming a mixture of a precipitate of silver tungstate, and tungsten carbide particles, separating said mixture from said suspension, reducing the silver tungstate in said mixture to metallic silver and tungsten, and carburizing said metallic tungsten to tungsten carbide, to obtain particles of silver containing tungsten carbide.
Dependencies are inferred from the claim text.