Evaluating breakthrough pressure in gas diffusion layers of proton exchange membrane fuel cells |
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Authors: | Yue Ma Jia Li Zhuqian Zhang Xia Wang |
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Affiliation: | [1]School of Mechanical and Electroriic Control Engineering, Beijing Jiaotong University, Beijing 100044, China [2]Department of Mechanical Engineering, Oakland University, Rochester, MI 48309, USA |
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Abstract: | This paper studied the breakthrough pressure for liquid water to penetrate the gas diffusion layer (GDL) of a proton exchange
membrane fuel cell (PEMFC). An ex-situ testing was conducted on a transparent test cell to visualize the water droplet formation
and detachment on the surface of different types of GDLs through a CCD camera. The breakthrough pressure, at which the liquid
water penetrates the GDL and starts to form a droplet, was measured. The breakthrough pressure was found to be different for
the GDLs with different porosities and thicknesses. The equilibrium pressure, which is defined as the minimum pressure required
maintaining a constant flow through the GDL, was also recorded. The equilibrium pressure was found to be much lower than the
breakthrough pressure for the same type of GDL. A pore network model was modified to further study the relationship between
the breakthrough pressure and the GDL properties and thicknesses. The breakthrough pressure increases for the thick GDL with
smaller micro-pore size. |
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Keywords: | PEMFC Gas diffusion layer Visualization Network model |
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