| abstract |
7-layer MEA assemblies with gasket, comprising: - a film of ionomeric membrane (3) having size variations in the two orthogonal plane directions, x and y, lower than 4%, determined according to the formula: (A-B)x100/B, wherein: - B is the membrane length in the x or y direction, after drying under vacuum for a time of 1 h at 105°C and at a residual pressure lower than 30 mBar; - A is the membrane length in the same direction where B is measured after membrane treatment in distilled water at 100°C for 30 minutes; - two GDL sheets (1) and (2) made of a porous material having on one surface an electrocatalytic layer coextensive with the membrane (3) sur- face; - the two sheets (1) and (2) positioned so that the electrocatalytic layer comes into contact, respectively, with each of the two membrane faces; - a gasket (4) positioned according to a frame shape along the assembly perimeter. |