ELECTROLYTE MEMBRANE FOR A FUEL CELL COMPRISING THE BLEND OF POLYMERS WITH DIFFERENT SULFONATION DEGREE, MEMBRANE-ELECTRODE ASSEMBLY, AND A FUEL CELL COMPRISING THE SAME

摘要

PURPOSE: A fuel cell electrolyte membrane is provided to have excellent cell performance and long term dimensional stability, and to obtain interfacial stability because a membrane/electrode interface separation phenomenon is not occurred after long term operation. CONSTITUTION: A fuel cell electrolyte membrane comprises a blend of sulfonated polymers which are the same, or two or more kinds of polymers having different sulfonation degrees. The sulfonate polymers are independently and respectively selected from sulfonated poly(ether sulfone), poly(thiosulfone), poly(ether ether ketone), polyimide, polystyrene, and polyphosphazene based sulfonated hydrocarbon based polymers. A membrane-electrode assembly comprises the fuel cell electrolyte membrane.