POROUS ELECTRODE BASE MATERIAL, MANUFACTURING METHOD THEREOF, MEMBRANE-ELECTRODE ASSEMBLY, AND FUEL CELL

摘要

PROBLEM TO BE SOLVED: To provide a porous electrode base material which sufficiently has high gas permeability and is excellent in conductivity in thickness and passing-through directions and exhibits a high moisture control function wherein variation of battery performance is less in spite of variation of humidification conditions when the porous electrode base material is used in a fuel cell, and to provide a manufacturing method thereof.

SOLUTION: The manufacturing method for the porous electrode base material includes: a process (A) of dispersing short carbon fibers and short binder fibers and producing short carbon fiber paper; a process (B) of giving polytetrafluoroethylene particles with average particle sizes of 10 nm to 2 μm and polyacrylonitrile to the short carbon fiber paper; a process (C) of heating and pressurizing the short carbon fiber paper obtained in the process (B); and a process (D) of carbonizing the polyacrylonitrile and thermally decomposing the polytetrafluoroethylene particles. These processes are carried out in the order in the manufacturing method for a porous electrode base material. It is preferable that the dispersed short carbon fibers can be connected with each other by porous carbon.

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