Journal
JOURNAL OF POWER SOURCES
Volume 245, Issue -, Pages 1005-1013Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.07.061
Keywords
Proton exchange membrane; Sulfonated poly(arylene ether sulfone)s; Bulky and rigid side chains; Dimensional stability; Cell performance
Funding
- National Basic Research Program of China [2012CB932802]
- National Science Foundation of China [51021003, 51133008]
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A new series of sulfonated cardo poly(arylene ether sulfone)s (SPES-x) with bulky and rigid side chains have been synthesized based on a novel bisphenol monomer containing electron rich tetraphenyl-methane groups. The SPES-x membranes show the desired characterizations such as high solubility in common organic solvents, good film-forming ability, excellent thermal and mechanical properties, and low methanol permeability. As ion exchange capacity (IEC) ranging from 1.61 to 2.14 mequiv g(-1), SPES-x membranes afford high conductivity (>0.08 S cm(-1)) and low swelling ratio under fully hydrated state at room temperature. Their excellent properties can be attributed to the formation of the well-defined phase-separated structures and well-connected proton transport channels observed in TEM and SAXS. Furthermore, the passive direct methanol fuel cells (DMFC) with SPES-20 membrane presents a maximum power density of 29.4 mW cm(-2) at 25 degrees C, which is superior to the value of Nafion(@) 117. (C) 2013 Elsevier B.V. All rights reserved.
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