Abstract: An electrolytic process in which an aqueous electrolyte is electrolysed in an electrolytic cell which comprises at least one anode and at least one cathode, in which oxygen is evolved at the anode, and which is operated at an anode current density of at least 3kA/m.sup.2, in which the anode comprises a substrate having at least in part an outer surface of tantalum, or of an alloy thereof, at least part of the tantalum or tantalum alloy substrate having a coating of an electrocatalytically-active material.The anode may be a tantalum-clad titanium substrate, and the process may be, for example, an electrogalvanizing or electrotinning process.

Abstract: A cathode for use in an electrolytic cell which comprises a metallic substrate, preferably of nickel alloy, and a coating thereon of a mixture of at least one platinum group metal and at least one platinum group metal oxide, the coating comprising from 2% to 30% by weight of platinum group metal. In the electrolysis of water or an aqueous solution e.g. an alkali metal chloride solution, the cathode has a low hydrogen over-voltage.