ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY OF TWIN WORKING ELECTRODES BRIDGED WITH CONDUCTING POLYMER LAYER

被引:9
作者
POPKIROV, GS [1 ]
BARSOUKOV, E [1 ]
SCHINDLER, RN [1 ]
机构
[1] CHRISTIAN ALBRECHTS UNIV KIEL,INST PHYS CHEM,D-24098 KIEL,GERMANY
关键词
ELECTROCHEMICAL IMPEDANCE; IMPEDANCE SPECTROSCOPY; TWIN WORKING ELECTRODE; CONDUCTING POLYMERS; POLYBITHIOPHENE;
D O I
10.1016/0013-4686(95)00125-X
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
A new technique is described for electrochemical impedance spectroscopic (EIS) investigations in the plane of a polymer layer coating an electrode without crossing the interface polymer-electrolyte. For this purpose a twin-working electrode configuration was constructed, that consists of two practically identical electrodes with a gap of a few micrometers width between them. This gap was bridged by a polymer layer of polybithiophene. Its behaviour was studied during electrochemical deposition on the twin electrode and during transition from insulating to conducting state upon oxidation. It is shown that for lower frequencies the impedance spectra obtained depend predominantly on the polymer conductivity and are not determined by the macroscopic external polymer/electrolyte interface. Contributions of capacitive ac currents that cross microscopic internal polymer-electrolyte interfaces in the deep pores of the polymer become considerable only in the higher frequency range.
引用
收藏
页码:1857 / 1862
页数:6
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