Process for the manufacture of silver-coated tungsten carbide electrode material
AssigneeSiemens Aktiengesellschaft
InventorsKarl Hohne, Konrad Mund
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Abstract
The invention concerns a method for the manufacture of an electrode material containing silver-coated tungsten carbide for electrochemical cells, particularly fuel cells and storage cells. Silver is precipitated on finely-divided tungsten carbide particles by reduction of a silver salt, and the tungsten carbide particles are thereby joined to form particles of larger grain size.
Claims9
A process for preparing silver-coated 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 alkaline solution, adding to said suspension a reducing agent capable of reducing silver ions in alkaline medium and also a silver salt soluble in said solution, the amounts of tungsten carbide and silver salt employed being sufficient to provide a silver content of approximately 10 to 20% by weight of said silver-coated tungsten carbide particles, and thereafter separating from said suspension silver-coated tungsten carbide particles.
Dependencies are inferred from the claim text.