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|Title:||X-ray Computed Tomography of Gas Diffusion Layers of PEM Fuel Cells - Calculation of Thermal Conductivity|
|Authors:||PFRANG Andreas; VEYRET Damien; SIEKER Frank; TSOTRIDIS Georgios|
|Citation:||INTERNATIONAL JOURNAL OF HYDROGEN ENERGY vol. 35 no. 8 p. 3751 - 3757|
|Publisher:||PERGAMON-ELSEVIER SCIENCE LTD|
|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 Institute:||Institute for Energy and Transport|
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