FREQUENCY-RESOLVED FARADAIC PROCESSES IN POLYPYRROLE FILMS OBSERVED BY ELECTROMODULATION TECHNIQUES - ELECTROCHEMICAL IMPEDANCE AND COLOR IMPEDANCE SPECTROSCOPIES

被引：58

作者：

AMEMIYA, T ^{[1
]}

HASHIMOTO, K ^{[1
]}

FUJISHIMA, A ^{[1
]}

机构：

[1] UNIV TOKYO, FAC ENGN, DEPT SYNTHET CHEM, BUNKYO KU, TOKYO 113, JAPAN

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1993年 / 97卷 / 16期

关键词：

D O I：

10.1021/j100118a040

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Dynamics of faradaic processes in polypyrrole (PPy) films (thickness 0.26 mum) at different applied dc potentials have been investigated in the frequency domain by employing electrochemical impedance and color impedance (electromodulated optical transmittance) spectroscopies. The faradaic processes in the PPy films have been resolved into a fast and a slow process over the potential range in which the PPy films arc in the highly conducting or intermediately oxidized state. These faradaic processes were modeled with an equivalent circuit taking into account two kinds of ionic trapping sites which evolve with dc potentials. Counterion transport through the film is treated in terms of diffusion and migration control: The diffusion coefficients obtained from the two mechanisms suggest that the diffusion control model prevails in the highly conducting PPy films encountered in our experimental conditions.

引用

页码：4187 / 4191

页数：5

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