文献类型：期刊文献

英文题名：Phosphoric acid-doped cross-linked sulfonated poly (imide-benzimidazole) for proton exchange membrane fuel cell applications

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, Sch Mat Sci & Engn, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China;[2]Qinghai Univ, Chem Engn Coll, Xining 810016, Peoples R China

年份：2016

卷号：501

起止页码：220

外文期刊名：JOURNAL OF MEMBRANE SCIENCE

收录：;EI(收录号：20160301812019);WOS:【SCI-EXPANDED(收录号:WOS:000368629100023)】；

基金：This research is financially sponsored by the Fundamental Research Funds for the Central Universities and Shanghai Pujiang Program (Grant nos. WD1315012 and D200-2R-1181). The authors also thank the assistance of Professor Junliang Zhang, Doctoral Candidate Fengjuan Zhu 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); Phosphoric acid-doping; Cross-linking; Proton exchange membrane

摘要：A series of covalently cross-linked sulfonated poly(imide benzimidazole)s (CBrSPIBIs) were synthesized using 4,4'-bibromomethenyl diphenyl ether as a cross-linker. However, the cross-linked structure results in a reduction of ion conductivity due to the blockage of the hydrophilic channel. Thus, the alkaline imidazole ring was used as a cross-linking site and a basic site to absorb phosphoric acid (PA) molecules. Even at a low humidity and PA-doping level, the proton conductivity of the resulting PA-doped CBrSPIBI (PA-CBrSPIBI) membranes is one to two orders of magnitude higher than that of CBrSPIBI and Nafion due to the formation of a new proton transport pathway between PA and sulfonic acid groups. In addition, these membranes display excellent mechanical strength and chemical stability because of the cross linked structure. The tensile strength of PA-doped cross-linked membranes ranges from 47.2 to 55.5 MPa, and they can maintain their integrity and mechanical strength in water for more than two months, which is superior to the corresponding sulfonated polyimide and polybenzimidazole blend membranes. (C) 2015 Elsevier B.V. All rights reserved.