Reinforced composite membrane for fuel cell and membrane-electrode assembly for fuel cell comprising the same

A composite membrane for fuel cells comprising:

• a porous support comprising three-dimensionally irregularly and discontinuously arranged nanofibers, the three-dimensionally irregularly and discontinuously arranged nanofibers including two different types of nanofibers comprising a first nanofiber and a second nanofiber, wherein the first nanofiber is made from a polymer selected from the group consisting of nylon, polyimide, polybenzoxazole, polybenzimidazole, polyamideimide, polyethylene terephthalate, polyethylene, polypropylene, copolymers thereof and mixtures thereof, and the second nanofiber is made from a first ionic conducting material;
• and
• a second ionic conducting material filled in pores of the porous support,
• wherein the first ionic conducting material is selected from the group consisting of sulfonated polyaryleneethersulfone, sulfonated polyetheretherketone, sulfonated polysulfone, sulfonated butadiene styrene and a mixture thereof,
• wherein the second ionic conducting material is selected from the group consisting of sulfonated polyimide, sulfonated polyarylethersulfone, sulfonated polyetheretherketone, sulfonated polybenzimidazole, sulfonated polysulfone, sulfonated polystyrene, sulfonated polyphosphazene and a mixture thereof, and
• wherein the composite membrane is used as a polymer electrolyte membrane in a membrane-electrode assembly for fuel cells.