Reference Electrode Placement in Thin Solid Electrolytes
Reference Electrode Placement in Thin Solid Electrolytes
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DOI：
10.1149/1.1467368
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发表时间：
2002-05
影响因子：
3.9
通讯作者：
S. Adler
中科院分区：
文献类型：
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作者：
S. Adler
为了分离阳极和阴极对薄型固体电解质电池阻抗的贡献，许多工作人员在非活性电解液的表面放置一个与工作电极共面的参比电极。在交流阻抗条件下，对电解液中的实部和虚部电势分布进行了有限元计算，从理论上对这种做法进行了评估。这一分析的结果表明，阳极和阴极对准的微小误差会在测量的半电池过电位中产生重大误差。这些误差不仅涉及定量的刻度因数，还涉及测量的半电池阻抗中阳极和阴极频率响应的交叉污染。即使电极完全对准，阳极和阴极动力学和/或频率响应之间的差异也可能导致阻抗的固有失真，包括频率色散和感应伪影。我们评估了两种可以用来避免歧义的方法(颗粒和微电极阵列)。
To separate anode and cathode contributions to the impedance of a thin solid electrolyte cell, many workers place a reference electrode on the surface of the inactive electrolyte, coplanar with the working electrode. This practice is evaluated theoretically using finite-element calculations of the real and imaginary potential distributions in the electrolyte under the conditions of ac impedance. The results of this analysis show that minor errors in the alignment of the anode and cathode can create significant errors in the measured half-cell overpotential. These errors involve not only quantitative scaling factors, but also cross-contamination of anode and cathode frequency response in the measured half-cell impedances. Even if electrodes are perfectly aligned, differences between the anode and cathode kinetics and/or frequency response may cause inherent distortion of the impedance, including frequency dispersion and inductive artifacts. We evaluate two approaches (pellets and microelectrode arrays) that can he used to avoid ambiguities.