Patent ID: 7544433

Claim:
A fuel cell comprising a pair of electrode catalyst layers, each containing a catalyst supported by carbon particles and ion-conductive binder, and a polymer electrolyte membrane placed between the electrode catalyst layers, wherein the polymer electrolyte membrane is formed from a sulfonated polyarylene consisting of 0.5 to 99.999% by mol of a first repeating unit represented by the general formula (1) and 0.001 to 99.5% by mol of a second repeating unit represented by the general formula (2): (wherein, a benzene ring in general formula (1) includes its derivative, and A is a divalent organic group selected from the group consisting of —O—, —S—, —CH═CH—, —C≡C—, —CO—, (wherein, I is an integer of from 1 to 100, —W— is a divalent electron attracting group; -T- is a divalent organic group; and R 1 to R 8 are a hydrogen atom or fluorine atom, an alkyl group, fluorine-substituted alkyl group, allyl group, aryl group or cyano group, and may be the same or different).