Oxygen-generating electrode and method for the preparation...

C - Chemistry – Metallurgy – 25 – B

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204/195.8

C25B 11/10 (2006.01) C25B 11/04 (2006.01) C25C 7/02 (2006.01)

Patent

CA 1335496

The electrode of the invention suitable for use in an oxygen-generating electrolytic process comprises (A) a substrate of, e.g., titanium metal and (B) a coating layer thereon which is formed with a mixture of iridium oxide, tantalum oxide and elementary platinum in a specified molar proportion. The coating layers can be formed by coating the substrate surface with a solution containing an iridium compound, tantalum compound and platinum compound each having thermal decomposability and then subjecting the coated substrate to a heat treatment in an oxidizing atmo- sphere so as to convert the iridium and tantalum compounds into respective oxides and the platinum compound into elementary platinum. Further, the coating layer is prefer- ably provided with an overcoating layer formed of iridium oxide or of a mixture of iridium oxide and tantalum oxide in a similar manner.

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