Method of manufacturing a fuel cell comprising an assembly electrode/membrane

摘要

The method comprises: bonding a reinforcement (131) having an opening in its central part to a proton exchange membrane and an electrode placed against a face of the membrane so that an inner edge of the reinforcement covers a periphery of the electrode with an overflow on the proton exchange membrane; forming a recess in a periphery of a gas diffusion layer (21) by a method of forming a wet watermark in the gas diffusion layer; and placing the gas diffusion layer so that the recess is formed directly below the inner edge of the reinforcement. The method comprises: bonding a reinforcement (131) having an opening in its central part to a proton exchange membrane and an electrode placed against a face of the membrane so that an inner edge of the reinforcement covers a periphery of the electrode with an overflow on the proton exchange membrane; forming a recess in a periphery of a gas diffusion layer (21) by a method of forming a wet watermark in the gas diffusion layer; and placing the gas diffusion layer so that the recess is formed directly below the inner edge of the reinforcement. The step of forming the watermark comprises applying a layer of an aqueous solution including carbon fibers and a binder material and solidifying components of the aqueous solution for forming the gas diffusion layer. The gas diffusion layer includes a recess formed to a depth of 25-75 mu m and with a width of 500-3000 mu m, and has a homogeneous disposed composition. The gas diffusion layer comprises a first face in which the recess is formed, and a second face. A portion of the second face to levelness of the recess is in alignment with a middle portion of the second face.