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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/16565

Title: Modelling water intrusion and oxygen diffusion in a reconstructed microporous layer of PEM fuel cells
Authors: Zhang, Xiaoxian
Gao, Yuan
Ostadi, Hossein
Jiang, Kyle
Chen, Rui
Keywords: Micro-porous layer
FIB/SEM tomography
Pore-scale modelling
Dusty model
PEM fuel cells
Issue Date: 2014
Publisher: © Elsevier
Citation: ZHANG, X. ... et al, 2014. Modelling water intrusion and oxygen diffusion in a reconstructed microporous layer of PEM fuel cells. International Journal of Hydrogen Energy, 39 (30), pp.17222-17230.
Abstract: The hydrophobic microporous layer (MPL) in PEM fuel cell improves water management but reduces oxygen transport. We investigate these conflict impacts using nanotomography and pore-scale modelling. The binary image of a MPL is acquired using FIB/SEM tomography. The water produced at the cathode is assumed to condense in the catalyst layer (CL), and then builds up a pressure before moving into the MPL. Water distribution in the MPL is calculated from its pore geometry, and oxygen transport through it is simulated using pore-scale models considering both bulk and Knudsen diffusions. The simulated oxygen concentration and flux at all voxels are volumetrically averaged to calculate the effective diffusion coefficients. For water flow, we found that when the MPL is too hydrophobic, water is unable to move through it and must find alternative exits. For oxygen diffusion, we found that the interaction of the bulk and Knudsen diffusions at pore scale creates an extra resistance after the volumetric average, and that the conventional dusty model substantially overestimates the effective diffusion coefficient.
Version: Accepted for publication
DOI: 10.1016/j.ijhydene.2014.08.027
URI: https://dspace.lboro.ac.uk/2134/16565
Publisher Link: http://dx.doi.org/10.1016/j.ijhydene.2014.08.027
ISSN: 0360-3199
Appears in Collections:Published Articles (Aeronautical and Automotive Engineering)

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