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Numerical Simulation of SOFC Electrode Polarization Using Three-Dimensional Microstructure Reconstructed by FIB-SEM

Published online by Cambridge University Press:  10 May 2012

Naoki Shikazono and
Nobuhide Kasagi
Naoki Shikazono
Affiliation:
Institute of Industrial Science, The University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo, 153-8505, JAPAN.
Nobuhide Kasagi
Affiliation:
Department of Mechanical Engineering, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, JAPAN.
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Abstract

Three-dimensional numerical simulations can provide information which cannot be obtained from experiments and can be a powerful tool for investigating reaction phenomena in solid oxide fuel cell (SOFC) electrodes. In the present study, a dual-beam focused ion beamscanning electron microscope is used to reconstruct the three dimensional microstructures of the SOFC electrodes, and their polarization characteristics are predicted by a lattice Boltzmann method. Predicted overpotentials for Ni-YSZ anode and mixed ionic and electronic conducting cathode (La0.6Sr0.4Co0.2Fe0.8O3-δ; LSCF6428) are compared with the experimental data for validation. In addition, three-dimensional distributions of electrochemical potential and current densities inside the electrode microstructures are obtained. Large non-uniformities of potential and current distributions are found in the Ni-YSZ anode, while those became much uniform in the LSCF cathode. The present method can be expected as a powerful tool for investigating local potential fields which affect local reactions and diffusion processes as well as local physical properties of the SOFC electrodes.

Keywords

ion-beam processingmorphologyscanning electron microscopy (SEM)

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1385: Symposium C – In-Situ Studies of Solid-Oxide Fuel-Cell Materials , 2012, mrsf11-1385-c08-03
Copyright
Copyright © Materials Research Society 2012

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