Title: X-ray Computed Tomography of Gas Diffusion Layers of PEM Fuel Cells - Calculation of Thermal Conductivity
Authors: PFRANG AndreasVEYRET DamienSIEKER FrankTSOTRIDIS Georgios
Citation: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY vol. 35 no. 8 p. 3751 - 3757
Publication Year: 2010
JRC N°: JRC55971
ISSN: 0360-3199
URI: www.elsevier.com/locate/he
DOI: 10.1016/j.ijhydene.2010.01.085
Type: Articles in periodicals and books
Abstract: Three commercially available gas diffusion layers were investigated by 3D X-ray computed tomography (CT). The carbon fibers and the 3D structure of the gas diffusion layers were clearly resolved by this lab-based technique. Based on 3D structures reconstructed from tomography data, the macroscopic, anisotropic effective thermal conductivities of the gas diffusion layers were calculated by solving the energy equation considering a pure thermal conduction problem. The average in-plane thermal conductivity for all samples, the carbon cloth and the two carbon papers, is by about a factor 4-12 larger than the average through-plane thermal conductivity. Furthermore, a clear dependence of thermal conductivity on the porosity and - especially for the carbon cloth - also on the local orientation of the fibers was observed.
JRC Directorate:Energy, Transport and Climate

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