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Affiliation of Author(s):化学工程学院

Teaching and Research Group:高分子化工

Journal:Journal of Power Sources

Funded by:国家自然科学基金项目

Key Words:Macromolecular cross-linked， Polybenzimidazole， Bromomethylated poly (aryl ether ketone)， High temperature proton exchange membrane

Abstract:A series of macromolecular cross-linked polybenzimidazole (PBI) membranes have been successfully prepared for the high temperature proton exchange membrane fuel cell (HT-PEMFC) applications. Bro- momethylated poly (aryl ether ketone) (BrPAEK) is synthesized and used as a macromolecular cross- linker, the cross-linking reaction can be accomplished at 160 C using an easy facial heating treat- ment. The resulting cross-linked membranes CBrPBI-X (X is the weight fraction of the cross-linker) display excellent mechanical strength. After phosphoric acid (PA) doping, the mechanical strength and proton conductivity of the PA/CBrPBI-X membranes are both enhanced comparing with the pristine PA/ PBI. Considering the tradeoff of the mechanical strength and proton conductivity, 10 wt% BrPAEK is demonstrated to be an optimum content in the matrix. For instance, the proton conductivity of PA/ CBrPBI-10 is 0.038 S cm1 at 200 C, which is higher than that of pristine PA/PBI with the proton con- ductivity of 0.029 S cm1 at the same temperature. Other properties of the cross-linked membranes are also investigated in detail, including the oxidative stability, solubility and thermal stability. All the results indicate that the PA/CBrPBI-10 membrane has the potential application in HT-PEMFCs.

First Author:wangshuang

Indexed by:Journal paper

Volume:243

Page Number:1

Translation or Not:no

Date of Publication:2013-06-11