文献类型：期刊文献

英文题名：In-Situ Gelled Covalent Organic Framework Membrane with Vacancies-Enhanced Anhydrous Proton Conductivity

作者：Zhang, Jin[1,2];Zhang, Han[1];Kong, Ya-Ru[1];Zhou, Linlong[2];Li, Siyao[2];Zhuang, Linzhou[2];Li, Nanwen[3];Ren, Xiao-Ming[1,4];Xu, Zhi[2]

机构：[1]Nanjing Tech Univ, Coll Chem & Mol Engn, State Key Lab Mat Oriented Chem Engn, Nanjing 211816, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[3]Chinese Acad Sci, State Key Lab Coal Convers, Inst Coal Chem, Taiyuan 030001, Peoples R China;[4]Nanjing Univ, State Key Lab Coordinat Chem, Nanjing 210023, Peoples R China

年份：2025

卷号：147

期号：22

起止页码：18934

外文期刊名：JOURNAL OF THE AMERICAN CHEMICAL SOCIETY

收录：;EI(收录号：20251818327074);WOS:【SCI-EXPANDED(收录号:WOS:001478796400001)】；

基金：The authors gratefully acknowledge the financial support from the following foundations and programs: the National Natural Science Foundation of China (Grant No. 22425802 to X.Z.), the China Postdoctoral Science Foundation (Grant No. 2024M760911 to Z.J.), the National Key R&D Program of China (Grant No. 2021YFB3801301), the National Natural Science Foundation of China (Grant No. 22073047), and the Shanghai Pilot Program for Basic Research (Grant No. 22TQ1400100-4).

语种：英文

摘要：The development of high-performance anhydrous proton-exchange membranes (APEMs) for electrochemical techniques remains a significant challenge. Covalent organic frameworks (COFs) offer a promising solution for APEMs due to their tunable channels and functionalizable skeletons. However, COFs are typically porous powders, which create extreme difficulties in processing them into self-standing APEMs, thereby limiting their practical applications. In this study, we propose a novel strategy for preparing COF-based APEMs for high-temperature proton exchange membrane fuel cell (HT-PEMFC) applications through acidification and gelation. In the gel, COF acts as both a gelling agent and proton trap, inhibits guest acid flow, and captures protons from the acid, leading to the formation of proton vacancies in the COF gel and greatly accelerating proton migration. As a result, COF gel membranes exhibit conductivities that far surpass that of the guest acid itself, exceeding 0.1 S cm-1 at temperatures above 140 degrees C, outperforming most reported COF materials. Notably, membrane electrode assemblies of HT-PEMFCs fabricated with a COF gel achieve a maximum power density of 150 mW cm-2 at 180 degrees C and anhydrous conditions. Our approach introduces an innovative strategy for the fabrication of self-standing COF-based APEMs, representing a significant breakthrough in the field of COF-based APEMs for fuel cell technology.