Patent ID: 8202664

Claim:
A membrane electrode assembly including an electrolyte membrane, an anode provided on one face of the electrolyte membrane and a cathode provided on the other face of the electrolyte membrane, wherein the electrolyte membrane contains a basic polymer having an average molecular weight of 1,000 to 1,000,000 and first strong acid, and the basic polymer and the first strong acid form a complex in the form of powder having a volume average particle diameter of 10 to 100μm, and a carbon layer containing carbon powder, a first binder, and second strong acid of the same type as the first strong acid contained in the electrolyte membrane, is between the electrolyte membrane and the anode or the electrolyte membrane and the cathode, the first binder comprising a fluorinated resin selected from the group consisting of polytetrafluoroethylene (PTFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), perfluoroethylene (PFA) and polyvinylidene fluoride (PVDF).