Electrochemische Energieconversie, N.v.

Constantine W De Brandt

Alain P Blanchart

Gustaaf J Spaepen

Gilbert J Van Bogaert

The invention relates to a porous electrode comprising at least a porous catalytic layer containing a catalytically active noble-metal, carbon and a polymeric binder and a porous metallic collector is situated on the electrolyte-side of this layer. According to the invention the catalytic layer has a thickness of less than 80 .mu.m and are the noble-metal particles in the layer situated on the surface and/or in the pores of part of the carbon particles, while the rest of the carbon particles contains no noble-metal particles. The invention meets the need of an electrode of the type described with a much lower noble-metal content, while the excellent characteristics as regards efficiency, power density and simplicity of manufacture are retained.

Porous electrode

The invention relates to an electrochemical zinc-oxygen cell comprising an oxygen electrode containing a porous electrically conductive layer, a zinc electrode, a diffusion of zincate restricting membrane, preferably an ionexchanging membrane, which is joined directly to the oxygen electrode between the porous layer of this electrode and the zinc electrode, and an electrolyte space between the membrane and the zinc electrode containing a liquid basic electrolyte. By preference the membrane is only slightly permeable for the electrolyte. With this cell no poisoning of the electrochemically active material occurs.

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Itterbeek, Belgium

Constantine W De Brandt