DIAPHRAGM FOR FUEL CELL

摘要

PROBLEM TO BE SOLVED: To develop a diaphragm suitable for a direct methanol fuel cell by way of a cation-exchange membrane with a hydrocarbon polymer as a base material, not a fluorine-containing polymer such as a perfluorocarbon sulfonic acid film.

SOLUTION: The diaphragm for a fuel cell, suitable for a direct methanol fuel cell, is made of a hydrocarbon system cation-exchange membrane with cation-exchange resin existing in pores of a porous film of a hydrocarbon polymer, with a film resistance in 3 mol/L sulfuric acid aqueous solution of 0.005 to 0.6 Ωcm2, preferably 0.01 to 0.5 Ωcm2, a bursting strength of 0.08 MPa or more, preferably 0.1 MPa or more, and a methanol transmittance at 25°C of 30 to 1,500g/m2/hr.

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