| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fuel cell free from quick degradation of power generation performance even though generated water starts to freeze in a fuel battery cell and enabled to start up at a sub-zero temperature without increasing the number of system structural components by securing an amount of heat generation through continuation of power generation. <P>SOLUTION: In the cell C of a fuel battery stack S, an oxidant gas side separator 4 and a fuel gas side separator 5 are arranged on both sides of an electrolyte membrane 11 by holding a MEA (membrane electrode assembly) 1 having an electrode made of electrolyte layers 21, 22 and diffusion layers 31, 32. An air flow passage 41 is formed on the oxidant gas side separator 4, and a hydrogen flow passage 51 is formed on the fuel gas side separator 5. The diffusion layers 31, 32 have a water-repellent layer 3 made of a strong water-repellent layer 3a and a weak water-repellent layer 3b on the surface at the electrolyte layers 21, 22 side. Water and liquid on an interface between the electrolyte layers 21, 22 and diffusion layers 31, 32 are cut off to prevent transmission of freezing by alternately arranging the strong water-repellent layer 3a and weak water-repellent layer 3b in parallel along the gas-flowing direction of the air flow passage 41 and hydrogen flow passage 51. <P>COPYRIGHT: (C)2009,JPO&INPIT |
