Catalyst-coated ionomer membrane with protective film layer and membrane-electrode-assembly made thereof

A catalyst-coated membrane comprises an ionomer membrane (1) having two surfaces, each has an active area coated with a catalyst layer and a passive area; and protective film layer(s) (3) attached to each of the two surfaces of the catalyst-coated membrane. The protective film layer overlaps the passive area and the active area. Independent claims are also included for: (a) a process for manufacturing a catalyst-coated membrane comprising applying at protective film layer(s) to two surfaces of an ionomer membrane under pressure and heat for 0.1-15 minutes; (b) a membrane-electrode-assembly comprising an ionomer membrane, gas diffusion layer(s) covering the active area of the catalyst-coated membrane, and protective film layer(s) contacting the active area, the passive area and the gas diffusion layer to form overlapped regions; and (c) a process for manufacturing a membrane-electrode-assembly comprising applying a gas diffusion layer and protective film(s) to two surfaces of an ionomer membrane.