Imidazole-microcapsule-supported heteropoly acid-sulfonated polyether ether ketone composite membrane, preparation and application thereof

The present invention discloses an imidazole-microcapsule-supported heteropoly acid-sulfonated polyether ether ketone composite membrane, preparation and an application thereof. The membrane comprises a phosphotungstic acid supporting imidazole microcapsule and sulfonated polyether ether ketone. The preparation method comprises: preparing sulfonated polyether ether ketone from polyether ether ketone; adopting tetraethyl orthosilicate and adopting a sol-gel method to synthesize silica microspheres; adopting 1-vinylimidazole as a monomer, and adopting a precipitation co-distillation method to synthesize imidazole shell layer-containing hybrid microspheres; adopting a HF solution to etch to obtain imidazole microcapsules; soaking the imidazole microcapsule into a phosphotungstic acid solution to obtain phosphotungstic acid supporting imidazole microcapsules; and adding the phosphotungstic acid supporting imidazole microcapsules to a membrane casting solution formed from sulfonated polyether ether ketone, and carrying out casting on the obtained membrane casting solution to obtain the imidazole-microcapsule-supported heteropoly acid-sulfonated polyether ether ketone composite membrane. According to the preparation process, the preparation process is simple, conditions are mild, controllability is strong, raw material sources are rich, and the prepared hybrid membrane can be directly used for direct methanol fuel cell proton exchange membranes.