Gel-state polybenzimidazole proton exchange membranes with flexible alkyl sulfonic acid side chains for a wider operating temperature range(25–240 ℃)  

作　　者：Taizhong Zhu Danyi Zhu Jiazhen Liang Liang Zhang Fei Huang Lixin Xue 

机构地区：[1]Center for Membrane Separation and Water Science&Technology,College of Chemical Engineering,Zhejiang University of Technology,Hangzhou 310014,Zhejiang,China [2]College of Chemistry and Materials Engineering,Wenzhou University,Wenzhou 325035,Zhejiang,China Received 18 April 2023,Revised 30 May 2023,Accepted 31

出　　处：《Journal of Energy Chemistry》2023年第10期91-101,I0005,共12页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China (NSFC-22209147)。

摘　　要：High-temperature proton exchange membrane fuel cells(HT-PEMFC) possess distinct technical advantages of high output power, simplified water/heat management, increased tolerance to fuel impurities and diverse fuel sources, within the temperature range of 120–200 ℃. However, for practical automobile applications, it was crucial to broaden their low-temperature operating window and enable cold start-up capability. Herein, gel-state phosphoric acid(PA) doped sulfonated polybenzimidazole(PBI) proton exchange membranes(PEMs) were designed and synthesized via PPA sol-gel process and in-situ sultone ring-opening reactions with various proton transport pathways based on absorbed PA, flexible alkyl chain connected sulfonic acid groups and imidazole sites. The effects of flexible alkyl sulfonic acid side chain length and content on PA doping level, proton conductivity, and membrane stability under different temperature and relative humidity(RH) were thoroughly investigated. The prepared gel-state membranes contained a self-assembled lamellar and porous structure that facilitated the absorption of a large amount of PA with rapid proton transporting mechanisms. At room temperature, the optimized membrane exhibited a proton conductivity of 0.069 S cm^(-1), which was further increased to 0.162 and 0.358 S cm^(-1)at 80 and 200 ℃, respectively, without additional humidification. The most significant contribution of this work was demonstrating the feasibility of gel-state sulfonated PBI membranes in expanding HT-PEMFC application opportunities over a wider operating range of 25 to 240 ℃.

关 键 词：Wide temperature range Proton exchange membrane Fuel cell Gel-state POLYBENZIMIDAZOLE 

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]