| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fuel cell wherein the moisture distribution in an in-plane direction of a polymer electrolyte is made uniform and oxidization gas can be efficiently supplied to an air electrode catalyst layer. <P>SOLUTION: The fuel cell includes a membrane-electrode assembly having a polymer electrolyte membrane 200 and a pair of catalyst electrodes pinching the polymer electrolyte membrane, and a separator having a gas flow channel for supplying fuel gas or oxidization gas to the membrane-electrode assembly. The gas flow channel is formed in a meandering or spiral shape, an upstream flow channel of the gas flow channel is adjacent to a downstream flow channel of the gas flow channel, a wall of the gas flow channel does not have permeability of the fuel gas or oxidization gas, the catalyst electrodes are each structured of a catalyst layer placed so as to be in contact with the polymer electrolyte membrane, carbon coat layers 330, 430 placed outside the catalyst layer, and gas diffusion substrate layers 340, 440 placed outside the carbon coat layers. Water vapor permeability of the gas diffusion substrate layers is less than that of the carbon coat layers. <P>COPYRIGHT: (C)2009,JPO&INPIT |
