Patent ID: 8338059

Claim:
A method for producing a membrane-electrode assembly comprising electrodes consisting of an anode comprising a gas diffusion layer and a catalyst material-containing active layer, a cathode comprising a diffusion layer and a catalyst material-containing active layer, and an electrolyte membrane interposed between the anode and the cathode and comprising a catalyst material-containing active layer at one or both sides, the method comprising the steps of: (a) forming a catalyst material-containing active layer on the surface of a electrolyte membrane; (b) forming a catalyst material-containing active layer on the surface of a gas diffusion layer; and (c) hot-pressing the gas diffusion layer to the electrolyte membrane, wherein the viscosity of the active layer, which is applied on the gas diffusion layer at the step (b), is controlled in a range of 100 to 10,000 cPs, and the viscosity of the active layer, which is applied on the electrolyte membrane at the step (a), is less than 10 cPs.