Modification strategies for non-aqueous, highly proton-conductive benzimidazole-based high-temperature proton exchange membranes  

作　　者：Yunfa Dong Shijie Zhong Yuhui He Zhezhi Liu Shengyu Zhou Qun Li Yashuai Pang Haodong Xie Yuanpeng Ji Yuanpeng Liu Jiecai Han Weidong He 

机构地区：[1]National Key Laboratory of Science and Technology on Advanced Composites in Special Environments,and Center for Composite Materials and Structures,Harbin Institute of Technology,Harbin 150080,China [2]School of Petroleum Engineering,Chongqing University of Science and Technology,Chongqing 401331,China [3]School of Physics,University of Electronic Science and Technology of China,Chengdu 610054,China [4]MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage,School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin 150001,China [5]Chongqing Research Institute,Harbin Institute of Technology,Chongqing 401151,China [6]School of Mechanical Engineering,Chengdu University,Chengdu 610106,China

出　　处：《Chinese Chemical Letters》2024年第4期43-51,共9页中国化学快报（英文版）

基　　金：supported by the Science Foundation of National Key Laboratory of Science and Technology on Advanced Composites in Special Environments;the National Natural Science Foundation of China (No.12002109);sponsored by Natural Science Foundation of Chongqing, China (Nos.CSTC2021jcyj-msxm X10305, CSTB2022NSCQMSX0246, CSTB2022NSCQ-MSX0242, CSTB2022NSCQMSX1244, CSTB2022NSCQ-MSX0441, CSTB2022NSCQMSX1356, CSTB2022NSCQ-MSX1572, CSTB2022NSCQ-MSX1583, CSTB2022NSCQ-MSX0487, CSTB2022TFII-OFX0034);Chongqing Technology Innovation and Application Development Special Key Project (No.CSTB2023TIAD-KPX0010)。

摘　　要：High-temperature proton exchange membranes(HT-PEMs) possess excellent thermal and outstanding electrochemical stability, providing an avenue to realize high-temperature proton exchange membranes fuel cells(HT-PEMFCs) with both superior power density and long-term durability. Unfortunately, polybenzimidazole(PBI), a typical material for conventional HT-PEMs, fails to compromise the high nonaqueous proton conductivity and high mechanical properties, thus hindering their practical applications.Achieving efficient nonaqueous proton conduction is crucial for HT-PEMFC, and many insightful research works have been done in this area. However, there still lacks a report that integrates the host-guest interactions of phosphoric acid doping and the structural stability of polymers to systematically illustrate modification strategies. Here, we summarize recent advancements in enhancing the nonaqueous proton conduction of HT-PEMs. Various polymer structure modification strategies, including main chain and side group modification, cross-linking, blocking, and branching, are reviewed. Composite approaches of polymer, including compounding with organic porous polymers, filling the inorganic components and modifying with ionic liquids, etc., are also covered in this work. These strategies endow the HT-PEMs with more free volume, nanophase-separated structure, and multi-stage proton transfer channels, which can facilitate the proton transportation and improve their performance. Finally, current challenges and future directions for further enhancements are also outlined.

关 键 词：BENZIMIDAZOLE Nonaqueous proton conduction Free volume Nanophase-separated structure Structure modification 

分 类 号：TB383.2[一般工业技术—材料科学与工程] TM911.4[电气工程—电力电子与电力传动]