| abstract |
(57) [Abstract] [PROBLEMS] To reduce the amount of fluorine-based materials that require a lot of energy for production and also have a problem of disposal, and to simultaneously achieve high proton conductivity and long-term durability at high temperatures. It is to obtain a satisfactory membrane-electrode assembly for a polymer electrolyte fuel cell. SOLUTION: The ion exchange membrane and / or the catalyst layer are as follows. A membrane-electrode assembly having the sulfonated polyarylethersulfone shown in (1). (In the formula, a is an integer of 1 to 4. p is an integer of 1 to 5. n is an integer of 2 to 1000. X represents H or a monovalent to tetravalent metal. Ar represents an aromatic residue. ) |