Negative capacitance for polyaniline: an analysis via electrochemical impedance spectroscopy

被引：94

作者：

Chen, WC

Wen, TC ^{[1
]}

Gopalan, A

机构：

[1] Natl Cheng Kung Univ, Dept Chem Engn, Tainan 701, Taiwan

[2] Alagappa Univ, Dept Ind Chem, Karaikkudi, Tamil Nadu, India

来源：

SYNTHETIC METALS | 2002年 / 128卷 / 02期

关键词：

polyaniline (PANI); electrochemical impedance spectroscopy (EIS); negative capacitance; X-ray photoelectron spectroscopy (XPS);

D O I：

10.1016/S0379-6779(01)00667-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Polyaniline (PANI) films were electrodeposited on Pt electrode by cyclic voltammetry using an anodic switching potential of 0.90 V, which favored benzoquinone (BQ) as side product. The redox interactions between BQ and PANI were analyzed through electrochemical impedance spectroscopy (EIS). PANI films of different thickness were subjected to different applied potentials and impedance spectra were recorded. PANI films were found to show negative capacitance (inductive loop) in the potential range of 0.50-0.70 V. A redox mechanism involving the role of BQ to impart negative capacitance to PANI is given and supported by the results from X-ray photoelectron spectroscopy (XPS). An equivalent circuit including an inductor element (L) is found to fit perfectly with data from EIS. The effect of thickness of PANI on L-value is elucidated and discussed. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：179 / 189

页数：11

共 39 条

[11] The electrocatalytic oxidation of methanol at finely dispersed platinum nanoparticles in polypyrrole films [J].