| 摘要 |
PROBLEM TO BE SOLVED: To maintain the power generation characteristic of a fuel cell provided with a level difference MEA over a long period of time.SOLUTION: In a second electrode (for example, a cathode electrode 20) in a level difference MEA 10, an outer edge part of a second electrode catalyst layer 28 protrudes from a second gas diffusion layer 32. When the second gas diffusion layer 32 is inserted into an insertion hole 36 formed in a resin-made frame member 12, a clearance 38 is formed between the inner wall of the insertion hole 36 and the second gas diffusion layer 32. In the clearance 38 is formed a filling layer 40 for covering the protruding outer edge part of the second electrode catalyst layer 28. The oxygen permeability of the filling layer 40 is set to 2×10ml/m24hr atm or below. |
