Interpretation of Impedance Spectra of Solid Oxide Fuel Cells: L-Curve Criterion for Determination of Regularization Parameter in Distribution Function of Relaxation Times Technique
- Interpretation of Impedance Spectra of Solid Oxide Fuel Cells: L-Curve Criterion for Determination of Regularization Parameter in Distribution Function of Relaxation Times Technique
- 이해원; 김병국; 이종호; 김형철; 손지원; 지호일; 윤경중; 신지수; Moon-Bong Choi
- solid oxide fuel cell; impedance; distribution function of relaxation times
- Issue Date
- JOM : the journal of the Minerals, Metals & Materials Society.
- VOL 71, NO 11-3834
- 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.
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