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Effect of the anisotropy of gas diffusion layer on transport characteristics and performance of a PEM electrolysis cell

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  • Miao, Zheng
  • Jia, Tianxu
  • Xu, Jinliang
  • Xu, Chao

Abstract

The anisotropy of the porous materials imposes a substantial effect on the multi-physics transport characteristics in the gas diffusion layer (GDL). The present study developed isotropic and anisotropic three-dimensional, two-phase, non-isothermal models of the Proton Exchange Membrane electrolysis cell (PEMEC). The prediction of electrochemical kinetics is coupled with the mass and heat transfer models to derive the distribution of key parameters and investigate the impact of GDL anisotropy on PEMEC performance. It is found that the GDL anisotropy is mainly caused by the GDL deformation. The deformation reduces GDL porosity and permeability, hindering gases from escaping but enhancing the GDL heat conduction. The temperature of the isotropic GDL is about 4–6 K higher than the deformed GDL. The isotropic PEMEC model also overestimates the cell performance by about 10 % in terms of current/power density at the same cell voltages. Besides, it underestimates the non-uniformity of species concentration and local reaction rates. The local current density in the catalyst layer (CL) for both models shows a bimodal pattern, whereas the deformed GDL model exhibits a more uneven distribution. The parameter-sensitive analysis shows that the smaller contact angle, higher permeability, higher porosity, and higher temperature of the GDL benefit the PEMEC performance.

Suggested Citation

  • Miao, Zheng & Jia, Tianxu & Xu, Jinliang & Xu, Chao, 2025. "Effect of the anisotropy of gas diffusion layer on transport characteristics and performance of a PEM electrolysis cell," Energy, Elsevier, vol. 323(C).
  • Handle: RePEc:eee:energy:v:323:y:2025:i:c:s0360544225014379
    DOI: 10.1016/j.energy.2025.135795
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    References listed on IDEAS

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