期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 35, 期 10, 页码 4622-4629出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2010.02.012
关键词
Double microporous layer; Membrane electrode assembly; Back diffusion of water; Water management; Direct methanol fuel cell
资金
- National Natural Science Foundation of China [20673136, 20706056]
- National 863 High-Tech. Research Programs of China [2006AA05Z136, 2007AA05Z141, 2008AA05Z102]
- Chinese Academy of Sciences
- Jiangsu Polytechnic University [ZMF10020015]
- National Science Foundation of the USA [HRD-0833180]
- Division Of Human Resource Development [0833180] Funding Source: National Science Foundation
A novel membrane electrode assembly (MEA) is described that utilizes a double microporous layer (MPL) structure in the cathode of a passive direct methanol fuel cell (DMFC). The double MPL cathode uses Ketjen Black carbon as an inner-MPL and Vulcan XC-72R carbon as an outer-MPL. Experimental results indicate that this double MPL structure at the cathode provides not only a higher oxygen transfer rate, but enables more effective back diffusion of water; thus, leading to an improved power density and stability of the passive DMFC. The maximum power density of an MEA with a double MPL cathode was observed to be ca. 33.0 mW cm(-2), which is found to be a substantial improvement over that for a passive DMFC with a conventional MEA. A. C. impedance analysis suggests that the increased performance of a DMFC with the double MPL cathode might be attributable to a decreased charge transfer resistance for the cathode oxygen reduction reaction. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
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