Patent ID: 7824788

Claim:
A catalyst coated membrane (CCM) comprising a membrane having on one of the two surfaces a first electrocatalytic layer comprising a catalyst and on the other one a second electrocatalytic layer comprising a catalyst, wherein: the orthogonal projection of the perimeter of the first electrocatalytic layer on the second layer is distant from the perimeter of the second electrocatalytic layer at least 1 mm in each point of said projection; both the electrocatalytic layers and the membrane, comprise (per)fluorinated ionomers, and wherein the CCM has the following features: size variations in the orthogonal directions of the plane xy lower than 15% after CCM dipping in demineralized water at 100° C. for 30 minutes, dried at 105° C. under vacuum for one hour; the electrocatalytic layers of the CCM remain adherent to the membrane after 60 cycles by dipping in water at 80° C. for 8 hours and then in water at the temperature of 25° C. for 16 hours.