| 摘要 |
PROBLEM TO BE SOLVED: To prevent reaction gas from entering an end portion of a solid polymer electrolyte membrane provided with only one catalyst layer, and to effectively suppress the deterioration of the end portion of the solid polymer electrolyte membrane by preventing the accumulation of the reaction gas.SOLUTION: An electrolyte membrane/electrode structure 10a configuring a fuel cell 12 is equipped with an anode electrode 20 and a cathode electrode 22 for clipping a solid polymer electrolyte membrane 18. An electrode catalyst layer 20a of the anode electrode 20 and an electrode catalyst layer 22a of the cathode electrode 22 have different surface dimensions. Between the solid polymer electrolyte membrane 18 and a gas diffusion layer 22b, a frame-shaped film member 24 superimposed with an outer peripheral end portion 22ae of the electrode catalyst layer 22a and having a part 24a is provided. On the gas diffusion layer 20b side, a reaction gas permeation area 53 is provided around the outer periphery of the electrode catalyst layer 20a. |
