SOLID POLYMER FUEL CELL USING POROUS METAL GAS DIFFUSION SHEET PERFORMING OUTSTANDING CONTACT SURFACE CONDUCTIVITY FOR LONG PERIOD OF TIME AS STRUCTURAL MEMBER

摘要

PROBLEM TO BE SOLVED: To provide a solid polymer fuel cell in which a porous metal gas diffusion sheet as a constituent member performs superior contact surface conductivity for a long period of time.

SOLUTION: A porous metal gas diffusion sheet of the solid polymer fuel cell is structured of a porous sintered body made of austenitic stainless steel having a porosity of 60 to 99%, and an Au contact point made by diffusion joint on the surface of the porous sintered body with a diffusion distribution ratio occupying 20 to 70 area% through an insulation chromium oxide layer having an average thickness of 5 to 50 nm formed on a surface part of the porous sintered body at the time of sintering and satisfying a composition formula: Cr2O3, by application sintering of Au colloidal solution of super-fine particles Au powder having an average particle diameter from 2 to 100 nm, as well as a porous stainless steel gas diffusion sheet with a chromium oxide layer part at a part right under the Au contact point made of conductive chromium oxide which carries out reduction at sintering of the Au colloidal solution applied on the surface, and satisfying a composition: Cr2O3-X(where X is 0.05 to 1.1 by an atomic ratio).

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