Journal
JOURNAL OF POWER SOURCES
Volume 153, Issue 1, Pages 61-67Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2005.03.190
Keywords
passive direct methanol fuel cell; air breathing; nation membrane; cell performance; methanol crossover; fuel utilization
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The use of various Nation membranes, including Nation 117, 115 and 112 with respective thicknesses of 175 mu m, 125 mu m and 50 mu m, in a passive direct methanol fuel cell (DMFC) was investigated experimentally. The results show that when the passive DMFC operated with a lower methanol concentration (2.0 M), a thicker membrane led to better performance at lower current densities, but exhibited lower performance at higher current densities. When the methanol concentration was increased to 4.0 M, however, the three membranes exhibited similar cell voltages over a wide range of current densities. In contrast, this work also shows the polarization behaviors in an active DMFC when the three membranes were substantially different. Finally, the test of fuel utilization indicates that the passive DMFC with a thicker membrane exhibited higher efficiency. (c) 2005 Elsevier B.V. All rights reserved.
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