| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a gas diffusion layer for a solid polymer fuel cell capable of maintaining high water repellency for a long period of time, and to provide a membrane-electrode assembly for the solid polymer fuel cell which enables the solid polymer fuel cell to stably operate for a long period of time. <P>SOLUTION: The method of manufacturing the gas diffusion layer 13 includes: a first step for carrying out impregnation of water dispersion solution made by dispersing polytetrafluoroethylene in water into a gas diffusion layer base; a second step for coating a coating liquid made by dispersing carbon black and polytetrafluoroethylene in dispersion medium on the gas diffusion layer base 14; and a third step for baking the gas diffusion layer base 14 on which the coating liquid has been coated in order to make the gas diffusion layer 13, in particular, the water dispersion solution and/or the coating liquid are so made that non-ion surfactant whose half-mass temperature in air is in the range of 100 to 300°C of 0.5 to 10 mass% to the sum of polytetrafluoroethylene, and the surfactant is contained in the water dispersion solution and/or the coating liquid. <P>COPYRIGHT: (C)2007,JPO&INPIT |
