Metal electrodes for electrochemical processes

Details Metal electrodes for electrochemical processes Metal electrodes for electrochemical processes

C - Chemistry, Metallurgy

25

B

C25B 11/04 (2006.01)

Patent

CA 2166494

A metallic electrode for electrochemical processes comprising a metal support and on at least a portion of said support, a conductive coating consisting essentially of a mixed oxide compound of (i) a compound selected from the group consisting of the general formulae aM2?3 and bSb2?y; wherein M is selected from the group consisting of Al, Rh and Cr in the trivalent state; and y is 3 or 5, (ii) cRuO2, (iii) dIrO2 and (iv) eTiO2; wherein the mole fraction of the sum of a+b in the mixed oxide compound is in the range 0.01 to 0.42, the mole fraction c of RuO2 is in the range 0.00 - 0.42, the mole fraction of d of IrO2 is in the range 0.00 to 0.42, provided that the sum of c+d is at least 0.02 and the mole fraction e of TiO2 is in the range of 0.14 to 0.93. 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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