Cathode useful for the electrolysis of aqueous alkali metal halide solution
AssigneeCouncil of Scientific and Industrial Research
InventorsSurukkai Krishnamachari Rangarajan, Kailathuvalaappil Inniri Vasu, Sarangapani Krishnamurthy, Perumal Subbiah, Krishnaswamy Asokan, Kandasamy Subramanian, Vaithilingam Arumugam
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Abstract
Cathode overvoltage losses are a frequent problem in electrolysis of aqueous solutions. The present invention provides a cathode having a three component coating. The first component consists of at least one non-precious transition metal; the second consists of a precious metal or its oxide and the third consists of gold, platinum or both or their oxides.
Claims12
A cathode for the electrolysis of aqueous alkali chloride solution which comprises a conducting substrate material consisting essentially of carbon in an amount in the range of 0.03 to 0.2% by wt.;
- nickel in an amount in the range of 9 to 13% by wt.;
- chromium in an amount in the range of 17 to 23% by wt.;
- molybdenum in an amount in the range of 0.0 to 2.5% by wt. and iron in an amount in the range of 74.93 to 61.3% by wt., said substrate having a coating thereon consisting of a three component system, the first component consisting of nickel oxide, a second component consisting of at least one precious metal or its oxide selected from the group consisting of rhodium, iridium, palladium and osmium, and a third component consisting of gold, platinum, oxides of gold or platinum, or a mixture thereof.
Dependencies are inferred from the claim text.