Effective transport properties of the porous electrodes in solid oxide fuel cells

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DOIResolve DOI: http://doi.org/10.1177/2041296710394266
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Journal titleJournal of Power and Energy
Pages183197; # of pages: 15
Subjecteffective transport property; solid oxide fuel cells; porous electrodes; finite volume method; random walk simulation
AbstractThis article presents a numerical framework for the computation of the effective transport properties of solid oxide fuel cells (SOFCs) porous electrodes from three-dimensional (3D) constructions of the microstructure. Realistic models of the 3D microstructure of porous electrodes are first constructed from measured parameters such as porosity and particle size distribution. Then each phase in the model geometries is tessellated with a computational grid. Three different types of grids are considered: Cartesian, octree, and body-fitted/cut-cell with successive levels of surface refinement. Finally, a finite volume method is used to compute the effective transport properties in the three phases (pore, electron, and ion) of the electrode. To validate the numerical approach, results obtained with the finite volume method are compared to those calculated with a random walk simulation for the case of a body-centred cubic lattice of spheres. Then, the influence of the sample size is investigated for random geometries with monosized particle distributions. Finally, effective transport properties are calculated for model geometries with polydisperse particle size distributions similar to those observed in actual SOFC electrodes.
Publication date
AffiliationNational Research Council Canada; NRC Institute for Chemical Process and Environmental Technology
Peer reviewedYes
NRC number52236
NPARC number17719178
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Record identifier94fd5dfb-c1c6-43c4-bc2c-3b5b748eecf4
Record created2011-05-18
Record modified2016-05-09
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