Patent ID: 7722975

Claim:
A fuel cell comprising a membrane-electrode assembly comprising: (a) an anode; (b) a cathode; and (c) a polymer electrolyte membrane interposed between the anode and the cathode, said polymer electrolyte membrane comprising a sulfonated polysulfone polymer having the following repeating units: wherein R 1 -R 16 are independently hydrogen, a SO 3 H group, a methyl group, an ethyl group or an optionally branched (C 3-6 )alkyl group, with the proviso that at least one of R 1 -R 16 is a SO 3 H group; n+m is an integer from 10 to 1,000 inclusive; n is an integer from 0 to 999 inclusive; and m is an integer from 1 to 1,000 inclusive, and salts thereof.