文献类型：期刊文献

英文题名：Phosphoric Acid Doped Crosslinked Polybenzimidazole/Modified Graphene Oxide Composite Membranes for High Temperature Proton Exchange Membrane Applications

作者：Cai, Yangben[1];Yue, Zhouying[1];Teng, Xin[1];Xu, Shiai[1,2]

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

年份：2018

卷号：165

期号：11

起止页码：F914

外文期刊名：JOURNAL OF THE ELECTROCHEMICAL SOCIETY

收录：;EI(收录号：20192607089428);WOS:【SCI-EXPANDED(收录号:WOS:000441163900002)】；

基金：This research is financially supported by the National Natural Science Foundation of China (21764011), the Foundation from Qinghai Science and Technology Department (2017-HZ-803), Thousand Talents Program of Qinghai Province, Kunlun Scholar Award Program of Qinghai Province and Shanghai Aerospace Science and Technology Innovation Foundation.

语种：英文

外文关键词：Graphene - Proton exchange membrane fuel cells (PEMFC) - Tensile strength - Crosslinking - Phosphoric acid - High temperature applications - Chemical stability - Composite membranes - Phosphoric acid fuel cells (PAFC)

摘要：A radiation grafting graphene oxide reinforced polybenzimidazole (PBI-RGO) was fabricated and then crosslinked with a self-made crosslinker containing benzimidazole groups by a facile method to obtain crosslinked PBI/RGO (cPBI/RGO) membrane, which was further doped with phosphoric acid (PA) for high temperature proton exchange membrane (HT-PEM) applications. The introduction of benzimidazole groups in the crosslinker results in an increase in PA uptake from 222% to 303% and a reduction of tensile strength of the membrane. The crosslinking structure can effectively improve the tensile strength compared with uncrosslinked membrane at the same PA uptake. The crosslinked membrane shows higher remaining weight after immersion in Fenton's solution for 6 days and PA for 8 days than uncrosslinked membrane, indicating that it has better oxidative and chemical stability. The introduction of RGO and the crosslinking structure can also improve the proton conductivity of membrane. The proton conductivity of PA-doped cPBI/RGO membrane is 58.6 mS . cm(-1) at 170 degrees C without humidity, which is increased by 2.6 times compared with that of PA-doped PBI membrane. The crosslinking structure allows the membrane to have better stability and higher proton conductivity, thus making it suitable for HT-PEM applications. (C) 2018 The Electrochemical Society.