期刊
ELECTROCHIMICA ACTA
卷 75, 期 -, 页码 1-10出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.04.040
关键词
Polymer electrolyte fuel cell; Neutron imaging; PTFE loading; Channel configuration; Water profile
资金
- U.S. Department of Energy (DOE) Fuel Cell Technologies
- U.S. Department of Commerce
- NIST Ionizing Radiation Division
- Director's Office of NIST
- NIST Center for Neutron Research
- Department of Energy [DE-AI01-01EE50660]
- Academic Senate Council on Research, Computing and Library Resources at UCI
This work presents an in situ study on the water-content measurement in polymer electrolyte fuel cells (PEFCs) using neutron imaging. The effects of several important operating and design parameters on water content are examined, including the relative humidity (RH), the polytetraflouroethylene (PTFE) loadings in gas diffusion media including the microporous layer (MPL), current density, and flow field configurations including single-/quad-serpentine channels and co-/counter-flow configurations. Efforts are also made to distinguish water contents between the channel and land projected areas, and obtain the water profile along the gas flow path. We find that the highest water content occurs at a low current density for fixed operational stoichiometry, and liquid water emerges downstream at low humidity and increases rapidly after on-set. (C) 2012 Elsevier Ltd. All rights reserved.
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