Metal electrodes for electrochemical processes

Details Metal electrodes for electrochemical processes Metal electrodes for electrochemical processes

C - Chemistry, Metallurgy

25

B

204/195.7

C25B 11/04 (2006.01) C25B 11/08 (2006.01) C25B 11/10 (2006.01)

Patent

CA 2030669

Metal electrodes provided with a coating consisting essentially of a mixed oxide compound of (i) a compound of the general formula ABO4, having a structure of the rutile-type, where A is an element in the trivalent state selected from the group consisting of Al, Rh and Cr, and B is an element in the pentavalent state selected from the group consisting of Sb and Ta, (ii) RuO2 and (iii) TiO2; wherein the mole fraction of ABO4 is between 0.01 and 0.42, the mole fraction of RuO2 is between 0.03 and 0.42, and the mole fraction of TiO2 is between 0.55 and 0.96. The electrodes have low precious metal content, provide improved durability and improved current efficiency-anodic overvoltage performance. They are used in the electrolysis of chloride containing liquors in the production of, for example, chlorine and more particularly, chlorate.

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