期刊
JOURNAL OF POWER SOURCES
卷 352, 期 -, 页码 281-290出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.01.114
关键词
PEM fuel cell; Electrospun gas diffusion layer (eGDL); Electrospinning; X-ray radiography; Membrane dry-out; Liquid water management
资金
- Energy and Advanced Materials (TEAM) laboratory at the University of Toronto
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- NSERC Collaborative Research and Training Experience Program (CREATE) Program in Distributed Generation for Remote Communities
- Canada Research Chairs Program
- Ontario Ministry of Research and Innovation Early Researcher Award
- Connaught Fund
- Friends of Ara Mooradian and Mercedes-Benz Scholarships
- NSERC Canada Graduate Scholarship (CGS)
- Ontario Graduate Scholarship (OGS)
- Bert Wasmund Graduate Fellowship in Sustainable Energy Research
- NSERC CGS
- NSERC OGS
- Hatch Ltd.
- David Sanborn Scott and Ron D. Venter awards
- Canada Foundation for Innovation
- Natural Sciences and Engineering Research Council of Canada
- University of Saskatchewan
- Government of Saskatchewan
- Western Economic Diversification Canada
- National Research Council Canada
- Canadian Institutes of Health Research
- CLS Post-Doctoral and Graduate Student Travel Support Program
This is the second paper in a two-part series in which we investigate the impact of the gas diffusion layer structure on the liquid water distribution in an operating polymer electrolyte membrane (PEM) fuel cell through the procedures of design, fabrication, and testing of novel hydrophobic electrospun gas diffusion layers (eGDLs). In this work, fibre diameters and alignment in eGDLs are precisely controlled, and concurrent synchrotron X-ray radiography and electrochemical impedance spectroscopy (EIS) are used to evaluate the influence of the controlled eGDL parameters on the liquid water distribution' and on membrane liquid water content. For eGDLs with small fibre diameters (150-200 nm) and correspondingly smaller pore sizes, reduced liquid water accumulation under the flow field ribs is observed. However, more liquid water is pinned onto the eGDL at the interface with flow field channels. Orienting fibre alignment perpendicular to the flow field channel direction leads to improved eGDL-catalyst layer contact and prevents rib-channel membrane deformation. On the other hand, eGDLs facilitate significant membrane dry-out, even under highly humidified operating conditions at high current densities. (C) 2017 Elsevier B.V. All rights reserved.
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