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| Pore network simulation of two-phase transport characteristics in compressed gas diffusion layer of PEMEC
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| (1. Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan， Hubei 430070， China; 2. Hubei Key Laboratory of Fuel Cell, Wuhan University of Technology, Wuhan， Hubei 430070， China)
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Abstract Based on Toray 090 carbon paper, the gas diffusion layers in the proton exchange membrane electrolysis cell under different compression levels were randomly reconstructed,and the breakthrough pressure, capillary pressure curve, relative permeability and relative diffusivity of hydrogen in gas diffusion layer(GDL) were calculated by the three-dimensional pore network model. The mass transfer relationship of hydrogen in the cathode GDL was also investigated. The results show that the hydrogen mass transfer relation reconstructed from the pore network simulation data is more suitable for describing the hydrogen transport in the cathode GDL. The mass transfer performance parameters of relative permeability and relative diffusivity of hydrogen in GDL are almost unchanged under different compression levels. With the increasing of compression level, the resistance of hydrogen transmission in GDL is increased, which leads to the increase of produced hydrogen pressure at the membrane interface,and hydrogen is more likely to leak from the cathode transmembrane to the anode.
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Received: 19 August 2021
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