期刊
ELECTROCHIMICA ACTA
卷 236, 期 -, 页码 161-170出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.03.162
关键词
Polymer electrolyte membrane (PEM) fuel cell; gas diffusion layer (GDL); synchrotron X-ray; electrochemical impedance spectroscopy; material displacement
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- NSERC Canada Research Chairs Program
- Ontario Ministry of Research and Innovation Early Researcher Award
- Canada Foundation of Innovation (CFI)
- University of Toronto
- Mercedes-Benz Canada Graduate Fellowship in Fuel Cell Research
- HATCH Graduate Scholarship
- David Sanborn Scott & Ron D. Venter Fellowship
- William Dunbar Memorial Scholarship in Mechanical Engineering
- Mercedes-Benz Canada Graduate Fellowship for Fuel Cell Research
- Ara Mooradian Scholarship
- Canada Foundation for Innovation
- Natural Sciences and Engineering Research Council of Canada
- National Research Council Canada
- Canadian Institutes of Health Research
- Government of Saskatchewan
- Western Economic Diversification Canada
- University of Saskatchewan
Synchrotron X-ray radiography was used to visualize the liquid water accumulation in polymer electrolyte membrane (PEM) fuel cells to compare the impact of carbon substrate thickness on water management. A differential fuel cell with an active area of 0.68 cm(2) and rib/channel width of 0.2 mm was custom-made to provide 1-dimensional (1D) conditions over the active area. The fuel cell with the thin substrate (TGP-H-030) outperformed the fuel cell with the thick substrate (TGP-H-060). The fuel cell with the thinner substrate exhibited a higher limiting current density, less liquid water in the microporous layer (MPL)-substrate transition region, and reduced oxygen transport resistance measured through electrochemical impedance spectroscopy (EIS). The compression behaviour of each GDL was also investigated through two consecutive fuel cell assemblies. The pressure in the second assembly was lower than that for the initial assemblies for both GDLs, and this significant change in assembly pressure was more pronounced for the thinner GDL (TGP-H-030). The resulting interfacial contact between the catalyst layer and the GDL was degraded, which manifested in the microscale displacement of fuel cell materials during operation (detected as a negative liquid water thickness). While the thinner GDL provided superior performance, the long term effects of material deformation may exacerbate a heterogeneous distribution of liquid water that could also impact the performance. (C) 2017 Elsevier Ltd. All rights reserved.
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