| 摘要 |
It is an object of the present invention to provide a fuel cell equipped with a membrane electrode assembly which can relax stress concentration at a catalyst layer end to prevent an electrolyte membrane damage and have high reliability. The membrane electrode assembly comprises an electrolyte membrane coated with an anode catalyst layer and anode diffusion layer on one side and with a cathode catalyst layer and cathode diffusion layer on the other side, wherein the anode and cathode catalyst layers have the same or essentially the same area and are set out at the same or essentially the same positions across the electrolyte membrane, and at least one of the anode and cathode diffusion layers is out of alignment, at least at one end, with the corresponding electrode catalyst layer to relax stress concentration at a catalyst layer end and prevent an electrolyte membrane damage.
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