Method for making anode with ruthenium and film forming...

C - Chemistry – Metallurgy – 25 – B

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C25B 11/10 (2006.01) C23F 13/12 (2006.01) C25B 1/34 (2006.01) C25B 11/04 (2006.01) C25B 11/08 (2006.01)

Patent

CA 1292723

A B S T R A C T A method for making an electrode suitable for use in an electrochemical process, comprises providing a base formed at least partially of at least one valve metal or alloy thereof. To said base, a first composition is applied which is a barrier precursor forming composition comprising a compound of ruthenium, a compound of a film-forming metal and a solvent, to form a coated layer on the base. Thereafter, the coated base is heated at a temperature from room temperature up to about 280°C for a sufficient period of time to dry the coated base without significant decomposition or oxidation of the compound of ruthenium and said compound of film- forming metal. Then, without baking the coated base to decompose and oxidize therein the compound of ruthenium and the compound of film-forming metal, at least one coating from a second composition, different from the first, is applied to the coated base. The second composition contains a solvent and an organic reducing agent and contains a noble metal compound and thus is capable of forming an electrocatalytic coating. After said second composition has been applied the coated base is baked at a temperature of 300 - 600°C.

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