This work presents three acidic types of proton conductors (covalently bonded PA, ion-pair bonded PA, and free PA) within phosphonated zwitterionic aromatic polymer structure. Covalently bonded PA groups and ion-pair bonded PA function as fixed proton sources, anhydride inhibitors, and free radical scavengers, effectively mitigating the dependence of proton conductivity on free PA. Furthermore, the incorporation of ion pair coordination significantly reduces the proton conductors leaching during operation. The synergistic interactions among these three proton-conducting structures lead to exceptional chemical stability and superior electrochemical performance of HT-PEMs.
- Xiaofeng Hao
- Xu Li
- Yuezhong Meng