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A Particle-Based Model for Effective Properties in Infiltrated Solid Oxide Fuel Cell Electrodes

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J. Electrochem. Soc.-2014-Bertei-F1243-53.pdfPublished version561.99 kBAdobe PDFView/Open
Title: A Particle-Based Model for Effective Properties in Infiltrated Solid Oxide Fuel Cell Electrodes
Authors: Bertei, A
Pharoah, JG
Gawel, DAW
Nicolella, C
Item Type: Journal Article
Abstract: A modeling framework for the numerical reconstruction of the microstructure of infiltrated electrodes is presented in this study. A particle-based sedimentation algorithm is used to generate the backbone, while a novel packing algorithm is used to randomly infiltrate nanoparticles on the surface of backbone particles. The effective properties, such as the connected triple-phase boundary length, the effective conductivity, the effective diffusivity, are evaluated on the reconstructed electrodes by using geometric analysis, finite volume and random-walk methods, and reported in dimensionless form to provide generality to the results. A parametric study on the effect of the main model and operating parameters is performed. Simulations show that the critical loading (i.e., the percolation threshold) increases as the backbone porosity decreases and the nanoparticle diameter increases. Large triple-phase boundary length, specific surface area and good effective conductivity can be reached by infiltration, without detrimental effects on the effective transport properties in gas phase. Simulations reveal a significant sensitivity to the size and contact angle of infiltrated particles, suggesting that the preparation process of infiltrated electrodes should be properly tailored in order to obtain the optimized structures predicted by the model.
Issue Date: 11-Sep-2014
Date of Acceptance: 29-Aug-2014
URI: http://hdl.handle.net/10044/1/41440
DOI: http://dx.doi.org/10.1149/2.0931412jes
ISSN: 0013-4651
Publisher: Electrochemical Society
Start Page: F1243
End Page: F1253
Journal / Book Title: Journal of the Electrochemical Society
Volume: 161
Issue: 12
Copyright Statement: This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives 4.0 License (CC BY-NC-ND, http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is not changed in any way and is properly cited.
Keywords: Energy
0303 Macromolecular And Materials Chemistry
0306 Physical Chemistry (Incl. Structural)
0912 Materials Engineering
Publication Status: Published
Appears in Collections:Faculty of Engineering
Earth Science and Engineering



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