Process for preparing an electrode for electrolytic cell having a coating of a single metal spinel, Co.sub.3 O.sub.4
AssigneeThe Dow Chemical Company
InventorsDonald L. Caldwell, Mark J. Hazelrigg, Jr.
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Abstract
Electrodes particularly suitable for use as anodes in electrolytic cells are prepared by coating an electrically-conductive substrate with a thermally-decomposable inorganic cobalt compound and then thermally oxidizing the inorganic cobalt compound under conditions at which the single-metal spinel, Co.sub.3 O.sub.4, is formed.
Claims16
A process for preparing improved electrolytic cell anodes comprising an electrically-conductive substrate having a coating consisting essentially of a single-metal spinel, Co.sub.3 O.sub.4, the said process comprising
- (a) providing an electrically-conductive substrate substantially free of foreign matter or oxide film,
- (b) applying to the substrate a thin coating of a thermally decomposable inorganic cobalt compound which, when thermally decomposed in the presence of oxygen gives Co.sub.3 O.sub.4,
- (c) heating the so-coated substrate at a temperature in the range of about 200.degree. C. to about 600.degree. C. in an oxidizing atmosphere for a time sufficient to oxidize the inorganic cobalt compound to Co.sub.3 O.sub.4, then cooling it, and
- (d) repeating the above coating step (b) and heating step (c) until the layer of Co.sub.3 O.sub.4 on the substrate has a thickness in the range of about 0.01 mm to about 0.08 mm.
In the process of preparing an electrolytic cell anode comprising an electroconductive substrate having a coating consisting essentially of Co.sub.3 O.sub.4, said coating being deposited on said substrate by (a) applying a thermally-decomposable cobalt compound to the substrate, (b) then heating at a temperature in the range of about 200.degree. C. to about 600.degree. C. in an oxidizing atmosphere to form the Co.sub.3 O.sub.4, and (c) cooling the so-coated substrate and repeating steps (a) and (b) and (c) a plurality of times, the improvement which comprises the use of an inorganic cobalt compound as the thermally-decomposable cobalt compound.
Dependencies are inferred from the claim text.