Distortions in Electrochemical Impedance Spectroscopy Measurements Using 3‐Electrode Methods in SOFC. II. Effect of Electrode Activity and Relaxation Times
Distortions in Electrochemical Impedance Spectroscopy Measurements Using 3‐Electrode Methods in SOFC. II. Effect of Electrode Activity and Relaxation Times
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SOFC 中使用 3 电极方法进行电化学阻抗谱测量的失真 II。
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
J. Hill
中科院分区：
文献类型：
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作者：
M. Cimenti;V. Birss;J. Hill
三电极配置通常用于量化固体氧化物燃料电池（SOFC）中阳极或阴极的过电势。在这种类型的设置中，参考电极 (RE) 用于将一个电极的电势损失与整个电池的电势损失隔离开来。然而，只要 RE 不能精确分离两个有源电极之间的电位降，就会得到错误的结果。在这项研究中，我们提出了理论和实验分析的结果，重点是验证 3 电极配置在电化学阻抗谱测量中对 SOFC 电极反应动力学表征的有效性。本文的重点是工作电极和反电极的特定区域极化电阻和阻抗时间常数的差异引起的阻抗测量的失真。平面和管状 SOFC 电池几何形状的数值和实验结果证明了所用理论模型的可靠性。根据此处介绍的系统模拟以及我们之前的工作，可以为 3 电极实验性 SOFC 的设计制定通用指南。这里使用的理论模型还可用于验证薄平面电池获得的 EIS 测量的一致性。
The 3‐electrode configuration is commonly applied to quantify the overpotential of anodes or cathodes in solid‐oxide fuel cells (SOFC). In this type of set‐up, a reference electrode (RE) is used to isolate the potential loss of one electrode from that of the entire cell; however, erroneous results can be obtained whenever the RE does not precisely separate the potential drop between the two active electrodes. In this study, we present the results of a theoretical and experimental analysis focused on verifying the effectiveness of the 3‐electrode configuration in electrochemical impedance spectroscopy measurements for the kinetic characterisation of SOFC electrode reactions. The focus of this paper is on the distortion of impedance measurements caused by differences in the area‐specific polarisation resistance and impedance time constants of the working and counter electrodes. The results obtained numerically and experimentally, both for planar and tubular SOFC cell geometries, prove the reliability of the theoretical model used. From the systematic simulation presented here and in our previous work, it was possible to formulate general guidelines for the design of 3‐electrode experimental SOFC. The theoretical model used here can also be used to verify the consistency of EIS measurements obtained with thin planar cells.