Patent ID: 8137861

Claim:
A membrane for direct-liquid fuel cell, comprised of a layered cation-exchange membrane whose one side is constituted by A) a cation-exchange membrane layer of low water content type having a water content of 1 to 15% by mass at a relative humidity of 50% RH (25° C.) and whose other side is constituted by B) a cation-exchange membrane layer of high water content type having, at a relative humidity of 100% RH (25° C.), a water content which is higher, by 3% by mass or more, than the water content of the cation-exchange membrane layer of low water content type at a relative humidity of 100% RH (25° C.), the layered cation-exchange membrane having an electrical resistance of 0.5 to 0.01 Ω·cm 2 in a 1 mol/L aqueous sulfuric acid solution at 25° C.