A numerical study on the performance of polymer electrolyte membrane fuel cells due to the variation in gas diffusion layer permeability |
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Authors: | Seung Man Baek Soo Gon Koh Kwang Nam Kim Jung Ho Kang Jin Hyun Nam and Charn-Jung Kim |
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Affiliation: | (1) Institute for Fuel Cell Innovation, National Research Council Canada, Vancouver, BC, Canada, V6T 1W5; |
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Abstract: | Convective flow in the under-rib regions of gas diffusion layers (GDLs) is a non-negligible transport process that can enhance
the performance of polymer electrolyte membrane fuel cells (PEMFCs) by facilitating efficient utilization of catalyst layers
(CLs) in those regions. The permeability of GDLs has been recognized as a dominant factor influencing the intensity of the
under-rib convection in PEMFCs. In this study, the correlation between the permeability of GDLs and the performance of PEMFCs
was numerically investigated through a detailed simulation of the transport and electrochemical processes in PEMFCs using
a computational fluid dynamics (CFD) tool. Three serpentine flow fields with one, three, or five parallel paths were considered
as reactant flow channels for an active cell area of 3 cm × 3 cm, while the permeability of GDLs was varied from 1×10−12 m2 to 1×10−10 m2. The effects of the flow field design and the GDL permeability on the performance of PEMFCs were presented, along with their
impacts on the local distribution of current density, water content, and reactant concentration. |
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Keywords: | |
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