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Zawodzinski, T. A., Jr.
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document
Direct methanol fuel cell performance using sulfonated poly (arylene ether sulfone) random copolymers as electrolytes.
Abstract
Sulfonated poly(arylene ether sulfone) random copolymers are a new series of sulfonic acid containing polymers that have shown promise as fuel cell electrolytes. Here, we report on direct methanol fuel cell (DMFC) performance of this class of polymers at sulfonation levels ranging from 40 to 60% (monomer basis). The DMFC performance of these polymers is compared to that of Nafion 117, the long standing standard in fuel cell testing. These polymers show a higher selectivity for protons over methanol for all the sulfonation levels tested, with the 40% sulfonated polymer showing 2.5 times the selectivity of Nafion. While the higher sulfonated forms (50 and 60%) did show a higher selectivity, only the lower sulfonation levels (40 and 45%) have shown improved performance in DMFC testing. The results of these experiments will be discussed in terms of the relevant test conditions, and experimentally determined membrane properties. The relevant DMFC properties of these polymers will be discussed in terms of sulfonation level and compared to those of Nafion 117.