Patent ID: 8361677

Claim:
A membrane/electrode assembly for a polymer electrolyte fuel cell, comprising an anode and a cathode each having a catalyst layer containing a fluoropolymer, and a polymer electrolyte membrane disposed between the anode and the cathode, wherein the fluoropolymer has an electrical conductivity of at least 0.07 S/cm at a temperature of 80° C. at a relative humidity of 40% and has a water content less than 150 mass %, and wherein the fluoropolymer has repeating units having a fluorinated structure having a group represented by the following formula (α): wherein Q 1 is a perfluoroalkylene group which may have an etheric oxygen atom, Q 2 is a single bond or a perfluoroalkylene group which may have an etheric oxygen atom, R f1 is a perfluoroalkyl group which may have an etheric oxygen atom, X is an oxygen atom, a nitrogen atom or a carbon atom, wherein a is 0 when X is an oxygen atom, a is 1 when X is a nitrogen atom and a is 2 when X is a carbon atom, and Y is a fluorine atom or a monovalent perfluoroorganic group.