期刊
JOURNAL OF MEMBRANE SCIENCE
卷 337, 期 1-2, 页码 318-323出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2009.04.006
关键词
Direct methanol fuel cell; Polymer electrolyte membrane; Chitosan; Methanol crossover
资金
- National Nature Science Foundation of China [20403002, 20773008]
- National High-tech RD program [2007AA05Z146]
- Beijing Novel Program [2008B12]
A series of blending chitosan sulfate membranes have been developed by grafting the chitosan monomers with sulfortic groups, then cross-linking the polymers from the bond reactions between the sulfortic groups in the chitosan sulfate and the amido groups in the pure chitosan monomers. Mechanical characterizations demonstrated that the dimensional swelling as well as the methanol crossover of the chitosan membranes were suppressed successfully by the polymer blending, with area swelling value decreased from 55.1% to 39.3% and methanol diffusion coefficient decreased from 1.0 x 10(-6) cm(2) s(-1) of pure chitosan to 4.7 x 10(-7) cm(2) s(-1) of the membrane with chitosan sulfate content of similar to 9.1 wt% (CCSM 110). The thermal analysis indicated that the blending chitosan sulfate membranes were structure stable below 100 degrees C. The blending membrane showed the best conductivity (0.03 S cm(-1) at 80 degrees C). The methanol permeability of CCSM 110 was much lower compared with that of Nafion 112 (1.9 x 10(-6) cm(2) s(-1)). (C) 2009 Elsevier B.V. All rights reserved
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