Catalyst coated membranes for water electrolysers

Abstract

A catalyst coated membrane for a water electrolyser, the catalyst coated membrane comprising: an ionomer membrane having a first surface and a second surface; an anode catalyst layer on the first surface of the ionomer membrane; and a cathode catalyst layer on the second surface of the ionomer membrane, wherein the ionomer membrane comprises at least one reinforcement layer, said reinforcement layer comprising a porous polymer reinforcement material which is impregnated with ionomer, wherein the or each reinforcement layer comprises between 5 and 20 wt % of the porous polymer reinforcement material relative to a total weight of ionomer and porous polymer reinforcement material in the reinforcement layer.

Dependencies are inferred from the claim text.