Composite proton exchange membrane and method for producing the same

Abstract

This invention belongs to the field of fuel cell materials technology, specifically relating to a composite proton exchange membrane and its preparation method. The composite proton exchange membrane consists of a perfluorosulfonic acid resin matrix and a proton conduction enhancer uniformly distributed within the matrix. The matrix possesses hydrophilic channels and a hydrophobic framework with a nanoscale phase-separated structure, and the proton conduction enhancer is distributed within the hydrophilic channels. The proton conduction enhancer is a bis(trifluoromethanesulfonyl)imine salt. The synergistic effect of the anions and cations of this salt with the hydrophilic channels and hydrophobic framework of the perfluorosulfonic acid resin matrix not only significantly improves the proton conduction capacity of the composite proton exchange membrane under high temperature and low humidity conditions but also achieves excellent dimensional stability and water balance. The preparation process of this composite proton exchange membrane does not require complex chemical reactions or extreme operating conditions, and it has good industrialization prospects.

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