GAS DIFFUSION LAYER FOR FUEL CELL AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a gas diffusion layer for a fuel cell and its manufacturing method advantageous for setting a pore diameter in a pore control layer in conformity with operating conditions for the fuel cell.

SOLUTION: The gas diffusion layer 5 for the fuel cell, for diffusing reaction gas supplied from a reaction gas distributing plate to a catalyst layer, includes a porous base layer 51 with gas permeability arranged at a side opposed to the distributing plate of the reaction gas, and a porous pore control layer 52 with gas permeability laminated on the base layer so as to be positioned at a side opposed to the catalyst layer. The base layer 51 uses as a base material conductive fiber with conductivity and an adhesive material with water repellency. The pore control layer uses as a base material conductive fiver with conductivity and an adhesive material with water repellency. A length of the conductive fiber of the pore control layer 52 is set relatively shorter than that of the conductive fiber of the base layer 51. An average pore diameter of pores of the pore control layer 52 is made relatively smaller than that of the pores of the base layer 51.

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