Negative capacitance or inductive loop? - A general assessment of a common low frequency impedance feature
Negative capacitance or inductive loop? - A general assessment of a common low frequency impedance feature
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DOI：
10.1016/j.elecom.2018.11.017
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发表时间：
2019-01-01
影响因子：
5.4
通讯作者：
Klotz, Dino
中科院分区：
文献类型：
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作者：
Klotz, Dino
阻抗分析并非易事。如果阻抗图中出现不寻常的形状，这一点就变得更加明显。这里讨论的是带有正虚部的低频挂钩，这通常会让研究人员对如何处理它一无所知，特别是当被测设备没有包括挂钩的通用模型时，这实际上对大多数电化学系统是正确的。从系统论的角度解释了低频挂钩，并给出了现象学上必须发生什么才能出现这一特征的非常基本的解释。回顾了这种低频挂钩最常见的等效电路模型，并讨论了它与一般经验低通滤波器型模型的关系。介绍了一个常见的电化学例子和一个抽象的极小例子，以便于解释任意(光电)电化学体系的低频挂钩。
Impedance analysis is not an easy task. This becomes even more obvious if unusual shapes appear in the impedance diagram. Here, a low frequency hook with positive imaginary part is discussed that often leaves researchers clueless of how to handle it, especially if there is no common model for the device under test that includes the hook, which is actually true for most electrochemical systems. The low frequency hook is explained from a systems theory perspective and a very basic explanation is given of what has to happen phenomenologically for this feature to appear. The most common equivalent circuit model (ECM) for such a low frequency hook is reviewed and the relation to a general empirical low-pass filter type model is discussed. A common electrochemical example and an abstract minimal example are introduced to facilitate the interpretation of the low frequency hook for an arbitrary (photo-) electrochemical system.