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Affiliation of Author(s):化学工程学院

Teaching and Research Group:高分子化工

Journal:International Journal of Hydrogen Energy

Funded by:国家自然科学基金项目

Key Words:Cross-linked, Epoxy, Polybenzimidazole, Proton exchange membrane

Abstract:A approach has been proposed to prepare the reinforced phosphoric acid (PA) doped cross-linked polybenzimidazole membranes for high temperature proton exchange membrane fuel cells (HT-PEMFCs), using 1,3-bis(2,3-epoxypropoxy)-2,2dimethylpropane (NGDE) as the cross-linker. FT-IR measurement and solubility test showed the successful completion of the crosslinking reaction. The resulting cross-linked membranes exhibited improved mechanical strength, making it possible to obtain higher phosphoric acid doping levels and therefore relatively high proton conductivity. Moreover, the oxidative stability of the cross-linked membranes was significantly enhanced. For instance, in Fenton’s reagent (3% H2O2 solution, 4 ppm Fe2+, 70 °C), the cross-linked PBI-NGDE-20% membrane did not break into pieces and kept its shape for more than 480 h, its remaining weight percent was approximately 65%. In addition, the thermal stability was sufficient enough within the operation temperature of PBI-based fuel cells. The cross-linked PBI-NGDE-X% (X is the content of epoxy resin in the cross-linked membranes) membranes displayed relatively high proton conductivity under anhydrous conditions. For instance, PBI-NGDE-5% membrane with acid uptake of 193% exhibited a proton conductivity of 0.017 S cm-1 at 200 °C. All the results indicate that it may be a suitable candidate for applications in HT-PEMFCs.

First Author:wangshuang

Indexed by:Journal paper

Volume:36

Page Number:1

Translation or Not:no

Date of Publication:2011-05-05