A physical interpretation of impedance at conducting polymer/electrolyte junctions
A physical interpretation of impedance at conducting polymer/electrolyte junctions
复制标题
导电聚合物/电解质连接处阻抗的物理解释
DOI：
10.1063/1.4863297
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发表时间：
2014
期刊：
影响因子：
1.6
通讯作者：
G. Malliaras
中科院分区：
文献类型：
--
作者：
E. Stavrinidou;M. Sessolo;B. Winther‐Jensen;S. Sanaur;G. Malliaras
我们监测电解质和导电聚合物之间的平面结中的去掺杂的过程中，使用电化学阻抗谱移动前沿测量期间进行。阻抗谱与时变电阻与电容并联的等效电路一致。我们表明，电阻器对应于在去掺杂区域的膜的离子传输，并可以定量地描述使用离子密度和漂移迁移率从移动前沿测量。另一方面，电容器不依赖于时间，并且与移动前沿的电荷分离相关联。这项工作提供了一个基于材料参数的导电聚合物/电解质界面阻抗的物理描述。
We monitor the process of dedoping in a planar junction between an electrolyte and a conducting polymer using electrochemical impedance spectroscopy performed during moving front measurements. The impedance spectra are consistent with an equivalent circuit of a time varying resistor in parallel with a capacitor. We show that the resistor corresponds to ion transport in the dedoped region of the film, and can be quantitatively described using ion density and drift mobility obtained from the moving front measurements. The capacitor, on the other hand, does not depend on time and is associated with charge separation at the moving front. This work offers a physical description of the impedance of conducting polymer/electrolyte interfaces based on materials parameters.