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Title: Investigation of the electrochemical active thickness of solid oxide fuel cell anode
Authors: Zheng, KQ
Li, L
Ni, M 
Issue Date: 13-Aug-2014
Source: International journal of hydrogen energy, 13 Aug. 2014, v. 39, no. 24, p. 12904-12912
Abstract: Determination of the electrochemical active thickness (EAT) is of paramount importance for optimizing the solid oxide fuel cell (SOFC) electrode. However, very different EAT values are reported in the previous literatures. This paper aims to systematically study the EAT of SOFC anode numerically. An SOFC model coupling electrochemical reactions with transport of gas, electron and ion is developed. The microstructure features of the electrode are modeled based on the percolation theory and coordinate number theory. Parametric analysis is performed to examine the effects of various operating conditions and microstructures on EAT. Results indicate that EAT increases with decreasing exchange current density (or decreasing TPB length) and increasing effective ionic conductivity. In addition to the numerical simulations, theoretical analysis is conducted including various losses in the electrode, which clearly shows that the EAT highly depends on the ratio of concentration related activation loss R-act,R-con to ohmic loss R-ohmic. The theoretical analysis explains very well the different EATs reported in the literature and is different from the common understanding that the EAT is controlled mainly by the ionic conductivity of electrode.
Keywords: Solid oxide fuel cell
Electrochemical active thickness
Publisher: Pergamon Press
Journal: International journal of hydrogen energy 
ISSN: 0360-3199
EISSN: 1879-3487
DOI: 10.1016/j.ijhydene.2014.06.108
Rights: Copyright © 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
NOTICE: this is the author’s version of a work that was accepted for publication in International journal of hydrogen energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. The definitive version Zheng, K., Li, L., & Ni, M. (2014). Investigation of the electrochemical active thickness of solid oxide fuel cell anode. International journal of hydrogen energy, 39(24), 12904-12912 is available at
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