Computation of oxygen diffusion properties of the microporous layer-gas diffusion medium assembly from the combination of X-ray microtomography and focused ion beam three dimensional digital images - Archive ouverte HAL Access content directly
Journal Articles Journal of Power Sources Year : 2023

Computation of oxygen diffusion properties of the microporous layer-gas diffusion medium assembly from the combination of X-ray microtomography and focused ion beam three dimensional digital images

Abstract

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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cea-04001129 , version 1 (22-02-2023)

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Mohamed Ahmed-Maloum, Thomas David, Laure Guetaz, Paul Duru, Joel Pauchet, et al.. Computation of oxygen diffusion properties of the microporous layer-gas diffusion medium assembly from the combination of X-ray microtomography and focused ion beam three dimensional digital images. Journal of Power Sources, 2023, 561, pp.232735. ⟨10.1016/j.jpowsour.2023.232735⟩. ⟨cea-04001129⟩
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