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

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

C - Chemistry, Metallurgy

25

B

204/195.2

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

Patent

CA 1327339

- 13 - ABSTRACT OF THE DISCLOSURE OXYGEN-GENERATING ELECTRODE AND METHOD FOR THE PREPARATION THEREOF The electrode of the invention suitable for use in an oxygen-generating electrolytic process with durability comprises (A) a substrate of, e.g., titanium metal; (B) an undercoating layer thereon which is formed of a mixture of an iridium oxide and tantalum oxide in a limited molar proportion and (C) an overcoating layer formed of an iridium oxide. The undercoating layer can be formed by coating the substrate surface with a solution containing an iridium compound and tantalum compound each having thermal decompo- sability and then subjecting the coated substrate body to a heat treatment in an oxidizing atmosphere. Similarly, the overcoating layer can be formed by coating with a solu- tion containing a thermally decomposable iridium compound followed by an oxidative heat treatment in an oxidizing atmosphere.

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