Journal
ELECTROCHIMICA ACTA
Volume 160, Issue -, Pages 281-287Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.01.094
Keywords
crosslinking; polybenzimidazole; mechanical strength; high temperature; fuel cell
Categories
Funding
- Natural Science Foundation of China [51172039]
- Fundamental Research Funds for the Central Universities of China [N130305001]
- Scientific Research Fund of Liaoning Provincial Education Department [L2014103]
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Covalently cross-linked hexafluoropropylidene polybenzimidazole (F6PBI) was prepared and used to fabricate high temperature proton exchange membranes with enhanced mechanical strength against thermoplastic distortion. Three different epoxides, i.e. bisphenol A diglycidyl ether (R-1), bisphenol A propoxylate diglycidyl ether (R-2) and poly(ethylene glycol) diglycidyl ether (R-3), were chosen as the cross-linkers to investigate the influence of their structures on the properties of the cross-linked F6PBI membranes. All the cross-linked F6PBI membranes displayed excellent stability towards the radical oxidation. Comparing with the pure F6PBI membrane, the cross-linked F6PBI membranes showed high acid doping level but less swelling after doping phosphoric acid at elevated temperatures. The mechanical strength at 130 degrees C was improved from 0.4 MPa for F6PBI membrane to a range of 0.8-2.0 MPa for the cross-linked F6PBI membranes with an acid doping level as high as around 14, especially for that crosslinking with the epoxide (R-3), which has a long linear structure of alkyl ether. The proton conductivity of the cross-linked membranes was increased accordingly due to the high acid doping levels. Fuel cell tests demonstrated the technical feasibility of the acid doped cross-linked F6PBI membranes for high temperature proton exchange membrane fuel cells. (C) 2015 Elsevier Ltd. All rights reserved.
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