Cathodes suitable for use in electrochemical processes evolving hydrogen
AssigneeJohnson Matthey Public Limited Company
InventorsPeter M. Willis, Ralph L. Phillips
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Abstract
A cathode suitable for use in an electrochemical process evolving hydrogen (for example the chloralkali process) in which the cathode comprises an electrically conductive substrate (1) made of a non-ferrous metal or having a coherent coating of non-ferrous metal on which is provided an electrocatalyst (4) comprising platinum and ruthenium and wherein the cathode is made more poison-resistant by a deposition of gold or silver and, optionally, a further deposition of PTFE. The cathode is particularly resistant to poisoning by iron.
Claims9
A cathode suitable for use in an electrochemical process evolving hydrogen comprising an electrically conductive substrate made of a non-ferrous metal or having a coherent, non-porous coating of non-ferrous metal and an electrocatalyst comprising a deposition of platinum and ruthenium or precursors thereof on the conductive substrate and a deposition of at least one of the metals gold and silver whereby the poison-resistance of the cathode to iron is increased as compared to a similar cathode without the gold or silver deposition.
Dependencies are inferred from the claim text.