Durable poly(binaphthyl-co-p-terphenyl piperidinium)-based anion exchange membranes with dual side chains  

作　　者：Weiting Gao Xuelang Gao Qiugen Zhang Aimei Zhu Qinglin Liu 

机构地区：[1]Department of Chemical&Biochemical Engineering,Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry,The College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,Fujian,China [2]Department of Chemistry,Pohang University of Science and Technology(POSTECH),Pohang 790-784,South Korea

出　　处：《Journal of Energy Chemistry》2024年第2期324-335,I0008,共13页能源化学（英文版）

基　　金：the financial support from the National Natural Science Foundation of China(22078272&22278340)。

摘　　要：Building well-developed ion-conductive highways is highly desirable for anion exchange membranes(AEMs).Grafting side chain is a highly effective approach for constructing a well-defined phaseseparated morphological structure and forming unblocked ion pathways in AEMs for fast ion transport.Fluorination of side chains can further enhance phase separation due to the superhydrophobic nature of fluorine groups.However,their electronic effect on the alkaline stability of side chains and membranes is rarely reported.Here,fluorine-containing and fluorine-free side chains are introduced into the polyaromatic backbone in proper configuration to investigate the impact of the fluorine terminal group on the stability of the side chains and membrane properties.The poly(binaphthyl-co-p-terphenyl piperidinium)AEM(QBNp TP)has the highest molecular weight and most dimensional stability due to its favorable backbone arrangement among ortho-and meta-terphenyl based AEMs.Importantly,by introducing both a fluorinated piperidinium side chain and a hexane chain into the p-terphenyl-based backbone,the prepared AEM(QBNp TP-QFC)presents an enhanced conductivity(150.6 m S cm^(-1))and a constrained swelling at 80℃.The electronic effect of fluorinated side chains is contemplated by experiments and simulations.The results demonstrate that the presence of strong electro-withdrawing fluorine groups weakens the electronic cloud of adjacent C atoms,increasing OH^(-)attack on the C atom and improving the stability of piperidinium cations.Hence QBNp TP-QFC possesses a robust alkaline stability at 80℃(95.3%conductivity retention after testing in 2 M Na OH for 2160 h).An excellent peak power density of 1.44 W cm^(-2)and a remarkable durability at 80℃(4.5%voltage loss after 100 h)can be observed.

关 键 词：Anion exchange membranes Backbone structure Fluorinated side chain Alkaline stability 

分 类 号：TQ425.236[化学工程] TM911.4[电气工程—电力电子与电力传动]