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REFERENCE ELECTRODE PLACEMENT IN THIN SOLID ELECTROLYTES

机译:参考电极在薄固体电解质中的位置

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In order 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 a.c. impedance. The results of this analysis show that: 1) minor errors in the alignment of the anode and cathode can create significant errors in the measured half-cell overpotential, 2) these errors involve not only quantitative scaling factors, but also cross-contamination of anode and cathode frequency response in the measured half-cell impedances, and 3) even if electrodes are perfectly aligned, differences between the anode and cathode kinetics and/or frequency response cause inherent distortion of the impedance, including low-frequency inductive artifacts. We evaluate two approaches (pellets and microelectrode arrays) that can be used to avoid ambiguities.
机译:为了将阳极和阴极对薄型固体电解质电池的阻抗的影响分开,许多工作人员将参考电极放置在非活性电解质的表面上,与工作电极共面。在理论上,使用交流电条件下电解质中实际和虚构的电位分布的有限元计算来评估这种做法。阻抗。分析的结果表明:1)阳极和阴极的对准中的微小误差会在测得的半电池超电势中产生显着误差,2)这些误差不仅涉及定量比例因子,而且还涉及阳极的交叉污染3)即使电极完全对齐,阳极和阴极动力学和/或频率响应之间的差异也会导致阻抗的固有失真,包括低频感应伪影。我们评估了可用于避免歧义的两种方法(小球和微电极阵列)。

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