期刊
JOURNAL OF POWER SOURCES
卷 561, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2023.232735
关键词
PEMFC; MPL; GDL; GDM; X-ray tomography; FIB-SEM; Diffusion tensor; Numerical simulations
The effective diffusion properties of a gas diffusion layer composed of fibrous gas diffusion medium (GDM) and a microporous layer (MPL) were characterized using numerical simulations and advanced imaging techniques. The MPL's diffusion tensor was determined using reconstructed 3D images obtained from micro X-ray computed tomography and focused ion beam-scanning electron microscopy. The through-plane diffusion coefficient of the GDM-MPL assembly was computed considering the presence of MPL cracks and GDM fibers. The impact of MPL penetration into the GDM and GDM compressibility were also evaluated.
The effective diffusion properties of a gas diffusion layer (GDL) made of the assembly of a fibrous gas diffusion medium (GDM) and a microporous layer (MPL) are characterized from numerical simulations on reconstructed images obtained from combining micro X-ray computed tomography and focused ion beam-scanning electron microscopy (FIB-SEM). Using a multiscale approach, the MPL effective diffusion tensor is characterized from the FIB-SEM reconstructed 3D images considering Knudsen and Fickian diffusions. The GDM-MPL assembly effective through-plane diffusion coefficient is computed via a mixed approach combing a continuum description for the MPL and the explicit consideration of the MPL cracks and GDM fibers. The impact of cracks in the MPL is thus evaluated. A diffusive resistance model is developed to evaluate the impact of the MPL penetration into the GDM and the impact of the GDM compressibility.
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