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Validation of a physically-based solid oxide fuel cell anode model combining 3D tomography and impedance spectroscopy

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Title: Validation of a physically-based solid oxide fuel cell anode model combining 3D tomography and impedance spectroscopy
Authors: Bertei, A
Ruiz-Trejo, E
Tariq, F
Yufit, V
Atkinson, A
Brandon, NP
Item Type: Journal Article
Abstract: This study presents a physically-based model for the simulation of impedance spectra in solid oxide fuel cell (SOFC) composite anodes. The model takes into account the charge transport and the charge-transfer reaction at the three-phase boundary distributed along the anode thickness, as well as the phenomena at the electrode/electrolyte interface and the multicomponent gas diffusion in the test rig. The model is calibrated with experimental impedance spectra of cermet anodes made of nickel and scandia-stabilized zirconia and satisfactorily validated in electrodes with different microstructural properties, quantified through focused ion beam SEM tomography. Besides providing the material-specific kinetic parameters of the electrochemical hydrogen oxidation, this study shows that the correlation between electrode microstructure and electrochemical performance can be successfully addressed by combining physically-based modelling, impedance spectroscopy and 3D tomography. This approach overcomes the limits of phenomenological equivalent circuits and is suitable for the interpretation of experimental data and for the optimisation of the electrode microstructure.
Issue Date: 5-Oct-2016
Date of Acceptance: 14-Sep-2016
URI: http://hdl.handle.net/10044/1/40461
DOI: https://dx.doi.org/10.1016/j.ijhydene.2016.09.100
ISSN: 1879-3487
Publisher: Elsevier
Start Page: 22381
End Page: 22393
Journal / Book Title: International Journal of Hydrogen Energy
Volume: 41
Issue: 47
Copyright Statement: © 2016 The Authors. Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC. This is an open access article under the CC BY license (http://creativecommons.org/ licenses/by/4.0/).
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Commission of the European Communities
Funder's Grant Number: EP/M014045/1
Keywords: Energy
09 Engineering
03 Chemical Sciences
Publication Status: Published
Appears in Collections:Faculty of Engineering
Earth Science and Engineering
Faculty of Natural Sciences
Grantham Institute for Climate Change