The invention provides an ultra-thin
proton exchange membrane for a fuel
cell and a preparation method thereof. The preparation method comprises the steps that 4,4-dichlorodiphenyl
sulfone, 4,4-biphenol and fuming
sulfuric acid are used as raw materials, and are dissolved in an N-methyl-2-pyrrolidinone
solvent,
anhydrous potassium carbonate is added, the temperature is risen slowly, meanwhile,
toluene and vinylidene
fluoride monomers are added slowly, an initiator is added after
reflux temperature rise reaction, meanwhile, stirring is carried out for
continuous reaction for 12h, a viscous solution is obtained, deionized water is poured into the viscous solution when the viscous solution is cooled to the
room temperature, and the ultra-thin
proton exchange membrane is obtained after washing,
drying and
tape casting. According to the ultra-thin
proton exchange membrane for the fuel
cell and the preparation method thereof, by adding a thin bonding layer to a sulfonated polyarylether
ketone membrane, the interface adhesion between the membrane and electrodes is improved, in addition, by reducing the thickness of the membrane, the distance of proton conduction in the membrane is reduced, the proton
conductivity is improved, and the defect of insufficient stability and proton
conductivity of the sulfonated modified polyarylether
sulfone proton exchange membrane is overcome.