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Microstructural Analysis of an LSCF Cathode Using In Situ Tomography and Simulation

Authors :
Masashi Kishimoto
Robert S. Bradley
Nigel P. Brandon
Andrew J. Marquis
John A. Kilner
Paul R. Shearing
Samuel J. Cooper
Farid Tariq
Source :
ECS Transactions. 57:2671-2678
Publication Year :
2013
Publisher :
The Electrochemical Society, 2013.

Abstract

Electrode tortuosity factor is a key input parameter in many fuel cell simulations. Three-dimensional microstructural data obtained from in-situ synchrotron X-ray nano-computed tomography is used as the basis for comparing five approaches to quantify the tortuosity factor. Three of these techniques are based on diffusivity simulations and showed strong correlation, but had consistently different absolute values. A random walk method showed a good degree of correlation to the diffusive approaches, but had the largest values overall. Lastly, a calculation that used a mean pore centroid approach showed little correlation to any of the other three methods, but compared well with the conventional Bruggeman correlation. Due to the diffusive nature of the ionic transport in electrodes, the authors would recommend calculating tortuosity factors using a diffusive approach based on the voxels rather than a remeshed volume.

Details

ISSN :
19386737 and 19385862
Volume :
57
Database :
OpenAIRE
Journal :
ECS Transactions
Accession number :
edsair.doi...........1e52ae19d2a132d6a051946f459d325b
Full Text :
https://doi.org/10.1149/05701.2671ecst