Interpretation of Impedance Spectra of Solid Oxide Fuel Cells: L-Curve Criterion for Determination of Regularization Parameter in Distribution Function of Relaxation Times Technique

Title
Interpretation of Impedance Spectra of Solid Oxide Fuel Cells: L-Curve Criterion for Determination of Regularization Parameter in Distribution Function of Relaxation Times Technique
Authors
이해원김병국이종호김형철손지원지호일윤경중신지수Moon-Bong Choi
Keywords
solid oxide fuel cell; impedance; distribution function of relaxation times
Issue Date
2019-11
Publisher
JOM : the journal of the Minerals, Metals & Materials Society.
Citation
VOL 71, NO 11-3834
Abstract
The distribution function of the relaxation times (DRT) technique is a powerful tool for the interpretation of impedance spectra of solid oxide fuel cells (SOFCs) because it enables direct identification of rate-limiting processes through mathematical calculations. Selection of an appropriate regularization parameter (kreg) is critical for obtaining meaningful deconvolution solutions in DRT analysis. Herein, we introduce an L-curve criterion as a reliable graphical tool for determination of the kreg value. In a parametric plot of log(solution norm) versus log(misfit norm), the kreg value at the corner of the L curve provides an optimum balance between the regularization error and perturbation error. In a case study on La0.6Sr0.4CoO3d-based cathodes, the DRT technique guided by the L-curve criterion enabled identification of rate-limiting processes and clarification of reaction pathways. The analytical methodology presented in this article provides guidelines for the effective use of the DRT technique for the impedance analysis of SOFCs.
URI
http://pubs.kist.re.kr/handle/201004/70108
ISSN
1047-4838
Appears in Collections:
KIST Publication > Article
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