文献类型：期刊文献

英文题名：Proton conducting sulfonated poly (imide-benzimidazole) with tunable density of covalent/ionic cross-linking for fuel cell membranes

作者：Yue, Zhouying[1];Cai, Yang-Ben[1];Xu, Shiai[1,2]

机构：[1]E China Univ Sci & Technol, Shanghai Key Lab Adv Polymer Mat, Key Lab Ultrafine Mat, Minist Educ,Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[2]Qinghai Univ, Chem Engn Coll, Xining 810016, Peoples R China

年份：2015

卷号：286

起止页码：571

外文期刊名：JOURNAL OF POWER SOURCES

收录：;EI(收录号：20151600757732);WOS:【SCI-EXPANDED(收录号:WOS:000355027400067)】；

基金：This research is financially sponsored by the Fundamental Research Funds for the Central Universities (WD1315012) and Shanghai Pujiang Program (D200-2R-1181). The authors also thank the assistance of Professor Junliang Zhang, Doctoral Candidate Fengjuan Zhu and Chao Wang in Institute of Fuel Cell, Shanghai Jiao Tong University in measuring single cell properties.

语种：英文

外文关键词：Sulfonated poly(imide benzimidazole); Cross-linked; Proton exchange membrane

摘要：Ionic cross-linked sulfonated polyimides containing bis-benzimidazole rings have been prepared from 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA), 6,6'-bis[2-(4-aminophenyl)benzimidazole] (BAPBI) and 3,3'-bis(4-sulfophenoxy)- benzidine (BSPOB). A new cross-linker, 4,4'-bibromomethenyl diphenyl ether, is used to induce covalent cross-linking between halogen and imidazole groups in SPIBI chains via a facile thermally activated reaction. The resulted covalent and ionic cross-linked membranes show an improved resistance to hydrolytic attack in deionized water at 80 degrees C (more than two months) and free radical attack in Fenton's solution (more than 690 min) as compared to non-cross-linked SPIBIs (less than two days and 270 min, respectively). Cross-linking also results in a reduction in proton conductivity due to the blockage of a hydrophilic channel. However, all the prepared CBr-ySPIBI-x membranes show a proton conductivity higher than 10(-2) S cm(-1) under hydrous condition. This could be attributed to the fact that more cross-linking sites are contained in each repeating unit, which ensures enough cross-linking degree at high sulfonation level. All these results suggest that CBr-ySPIBI-x membranes have a great potential for applications in the proton exchange membrane fuel cells. (C) 2015 Elsevier B.V. All rights reserved.