Dynamic electrochemical impedance spectroscopy, for electrocatalytic reactions

被引：41

作者：

Sacci, Robert L. ^{[1
]}

Seland, Frode ^{[2
]}

Harrington, David A. ^{[1
]}

机构：

[1] Univ Victoria, Dept Chem, Victoria, BC V8W 3V6, Canada

[2] Norwegian Univ Sci & Technol, Dept Mat Sci & Engn, NO-7491 Trondheim, Norway

来源：

ELECTROCHIMICA ACTA | 2014年 / 131卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Dynamic; EIS; Impedance; FFT; FARADAIC ADMITTANCE MEASUREMENTS; FAST FOURIER-TRANSFORM; AC CYCLIC VOLTAMMETRY; CURRENT LINEAR SWEEP; PITTING CORROSION; NONLINEAR DISTORTIONS; NUMERICAL-SIMULATION; PLATINUM-ELECTRODES; METAL-ELECTRODES; OXIDATION;

D O I：

10.1016/j.electacta.2014.02.120

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Dynamic electrochemical impedance spectroscopy with the ac signal applied while sweeping the potential, is a powerful method to study reaction mechanisms of surface electrochemical reactions. The ability to reliably measure low frequencies while sweeping is key to its successful implementation. Numerical modeling of a simple adsorption reaction is used to decide how fast the potential sweep can be at a given frequency. Careful baseline subtraction is crucial to achieve accurate results. Hardware and software implementing this method are described. With attention to issues of resolution and using the baseline correction algorithm described, accurate results can be obtained down to about 1 Hz under practical conditions. Sample experimental data is validated using the Kramers-Kronig transform and a consistency test involving the voltammogram slope and the low frequency data. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：13 / 19

页数：7

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