Abstract: Preparation of an electrode comprising a substrate of a valve metal or of an alloy thereof having similar properties thereto and a coating thereon comprising at least an outer layer of an electrocatalytically-active material which comprises an oxide of at least ruthenium and an oxide of at least one non-noble metal by a one-step coating process which comprises the vapor phase deposition of a mixture of at least ruthenium and/or oxide thereof and at least one non-noble metal or oxide thereof onto the substrate. The outer layer is of substantially uniform thickness, the contours thereof are at least substantially the same as the contours of the substrate underlying it and the electrode affords an increased surface area for a given mass of catalyst and a more efficient use of catalyst to obtain a given thickness thereof.

Abstract: A cathode wherein the electrocatalytically-active outer layer is of substantially uniform thickness and has contours which are at least substantially the same as the contours of the substrate immediately underlying it. The electrode may be prepared by depositing the electrocatalytically-active outer layer by physical vapour deposition. The electrocatalytically-active outer layer comprises (a) cerium and/or cerium oxide and at least one non-noble Group 8 metal or (b) platinum and/or platinum oxide and ruthenium and/or ruthenium oxide.

Abstract: Preparation of an electrode comprising a substrate of a valve metal or of an alloy thereof having similar properties thereto and a coating thereon comprising at least an outer layer of an electrocatalytically-active material which comprises an oxide of at least ruthenium and an oxide of at least one non-noble metal by a one-step coating process which comprises the vapor phase deposition of a mixture of at least ruthenium and/or oxide thereof and at least one non-noble metal or oxide thereof onto the substrate. The outer layer is of substantially uniform thickness, the contours thereof are at least substantially the same as the contours of the substrate underlying it and the electrode affords an increased surface area for a given mass of catalyst and a more efficient use of catalyst to obtain a given thickness thereof.