Journal
CHEMSUSCHEM
Volume 6, Issue 2, Pages 275-282Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201200716
Keywords
electrochemistry; fuel cells; materials science; membranes; polymers
Funding
- Danish ForskEL programme
- Danish Council for Independent Research [11-117035/FTP]
- Natural Science Foundation of China [51172039]
- Fundamental Research Funds for the Central Universities of China [N090105001, N110805001]
- China Scholarship Council (CSC)
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Covalently cross-linked polymer membranes were fabricated from poly(aryl sulfone benzimidazole) (SO2PBI) and poly(vinylbenzyl chloride) (PVBCl) as electrolytes for high-temperature proton-exchange-membrane fuel cells. The cross-linking imparted organo insolubility and chemical stability against radical attack to the otherwise flexible SO2PBI membranes. Steady phosphoric acid doping of the cross-linked membranes was achieved at elevated temperatures with little swelling. The acid-doped membranes exhibited increased mechanical strength compared to both pristine SO2PBI and poly[2,2'-(m-phenylene)-5,5'-bibenzimidazole] (mPBI). The superior characteristics of the cross-linked SO2PBI membranes allowed higher acid doping levels and, therefore, higher proton conductivity. Fuel-cell tests with the cross-linked membranes demonstrated a high open circuit voltage and improved power performance and durability.
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