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首页> 外文期刊>Journal of Applied Electrochemistry >AC impedance investigation of conductivity of automotive lubricants using two- and four-electrode electrochemical cells
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AC impedance investigation of conductivity of automotive lubricants using two- and four-electrode electrochemical cells

机译：使用两电极和四电极电化学电池的汽车润滑油电导率的交流阻抗研究

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摘要

Two- and four-electrode electrochemical cells were designed for characterization studies of highly resistive non-aqueous automotive lubricant using electrochemical impedance spectroscopy (EIS). The influence of internal configuration of the impedance analyzer, the media’s temperature and properties, shielding of the cables, and the electrochemical cell geometry and arrangement on the impedance results were investigated. The most accurate EIS measurements can be made in the two-electrode configuration with active shields where a single arc at high frequencies and a complicated low frequency impedance feature were observed in complex impedance plots. When four-electrode cells were employed, the impedance load, geometry and positioning of voltage electrodes; finite resistance of the impedance analyzer; and capacitive coupling between the signal lines introduced two types of impedance measurement artifacts. A capacitive-resistive low frequency load was interpreted as a measurement artifact originating from geometry and positioning of voltage electrodes. The appearance of additional medium frequency load combining resistive, capacitive and inductive features is intrinsic to the measurement setup and is due to a combination of several instrumental and experimental factors resulting in a voltage divider effect.
机译：设计了两电极和四电极电化学电池，用于使用电化学阻抗谱（EIS）表征高电阻非水汽车润滑油。研究了阻抗分析仪的内部配置，介质的温度和特性，电缆的屏蔽以及电化学池的几何形状和布置对阻抗结果的影响。可以在带有有源屏蔽的双电极配置中进行最精确的EIS测量，其中在复杂的阻抗图中可以观察到高频下的单个电弧和复杂的低频阻抗特征。当使用四电极电池时，电压电极的阻抗负载，几何形状和位置；阻抗分析仪的有限电阻；和信号线之间的电容耦合引入了两种类型的阻抗测量伪像。电容性低频负载被解释为源自电压电极的几何形状和位置的测量伪像。结合了电阻，电容和电感特性的附加中频负载的出现是测量设置所固有的，并且是由于几种仪器和实验因素的组合导致分压器效应。

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