Analytical and numerical models for impedance of a button SOFC anode

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry Pub Date : 2024-11-12 DOI:10.1016/j.jelechem.2024.118773

Marisa Knappe, Andrei Kulikovsky

引用次数: 0

Abstract

We report a physics-based model for the anode impedance of a button-type anode-supported SOFC. The model includes ion and electron charge conservation equations and a Fick’s diffusion transport equation for hydrogen in the anode support layer. In the limit of small overpotentials, an analytical solution for the anode impedance is derived. For typical SOFC anode parameters, this solution is valid from open–circuit voltage (OCV) up to the cell current density of about 5 mA cm⁻². Fast least-squares fitting of the model impedance to an experimental spectrum measured at OCV is demonstrated and the resulting fitting parameters are compared with literature data. A high-current numerical version of the model is also suitable for fast fitting of experimental impedance spectra.

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按钮式 SOFC 阳极阻抗的分析和数值模型

我们报告了一个基于物理学的钮扣式阳极支撑 SOFC 阳极阻抗模型。该模型包括离子和电子电荷守恒方程以及阳极支撑层中氢的菲克扩散传输方程。在小过电势极限下，得出了阳极阻抗的解析解。对于典型的 SOFC 阳极参数，从开路电压 (OCV) 到约 5 mA cm-2 的电池电流密度，该解法都是有效的。演示了将模型阻抗与在开路电压下测量的实验频谱进行快速最小二乘拟合的过程，并将拟合得到的参数与文献数据进行了比较。该模型的大电流数值版本也适用于快速拟合实验阻抗谱。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Electroanalytical Chemistry 化学-电化学

CiteScore

7.80

自引率

6.70%

发文量

912

审稿时长

2.4 months

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.