CATALYSED MEMBRANE

A catalysed membrane comprising a solid polymeric membrane and a catalyst layer deposited on one or both faces of the solid polymeric membrane, the catalyst layer comprising: (i) a first catalytic material, wherein the first catalytic material facilitates a hydrogen oxidation reaction; and (ii) a second catalytic material, wherein the second catalytic material facilitates an oxygen evolution reaction, wherein the second catalytic material comprises iridium or iridium oxide and one or more metals M or an oxide thereof, wherein M is selected from the group consisting of transition metals and Sn, wherein the first catalytic material is supported on the second catalytic material; and wherein the first catalytic material comprises a metal (the primary metal) which is platinum.