Journal
JOURNAL OF POWER SOURCES
Volume 255, Issue -, Pages 101-107Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2013.12.116
Keywords
Proton exchange membrane; Direct methanol fuel cells; Sulfonated poly(ether ether ketone); Sulfonated cross-linker
Funding
- National Nature Science Foundation of China [21074044, 51101073, 21104022]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20100061110011, 20110061120019]
- Special Fund for Basic Scientific Research of Central Colleges [201103088]
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A novel type of cross-linked proton exchange membrane of lower methanol permeation and high proton conductivity is prepared, based on a newly synthesized sulfonated cross-linker: carboxyl terminated benzimidazole trimer bearing sulfonic acid groups (s-BI). Compared to membranes cross-linked with non-sulfonated cross-linker (BI), SPEEK/s-BI-n membranes show higher IEC values and proton conductivities. Meanwhile, oxidative stability and mechanical property of SPEEK/s-BI-n membranes are obviously improved. Among SPEEK/s-BI-n membranes, SPEEK/s-BI-2 exhibits high proton conductivity, low swelling ratio (0.122 S cm(-1) and 15.2% at 60 degrees C, respectively) and low methanol permeability coefficient. These results imply that the cross-linked membranes prepared with the newly sulfonated cross-linker are promising for the direct methanol fuel cells (DMFCs) application. (C) 2014 Elsevier B.V. All rights reserved.
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