On the use of a constant phase element (CPE) in electrochemistry

被引：140

作者：

Gateman, Samantha Michelle ^{[1
]}

Gharbi, Oumaima ^{[2
]}

de Melo, Hercilio Gomes ^{[3
]}

Ngo, Kieu ^{[2
]}

Turmine, Mirelle ^{[2
]}

Vivier, Vincent ^{[2
]}

机构：

[1] Univ Western Ontario, Dept Chem, London, ON, Canada

[2] Sorbonne Univ, CNRS, Lab React Surface, Paris, France

[3] Escola Politecn Univ Sao Paulo, Dept Engn Metalurg & Mat, Ave Prof Mello Moraes 2463, Sao Paulo, SP, Brazil

来源：

CURRENT OPINION IN ELECTROCHEMISTRY | 2022年 / 36卷

关键词：

Impedance spectroscopy; Cyclic voltammetry; Constant-phase element; Double layer; Electrochemistry; Supercapacitor; IMPEDANCE MEASUREMENTS; CAPACITANCE; PARAMETERS;

D O I：

10.1016/j.coelec.2022.101133

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：

Several techniques can be used to experimentally determine the interfacial capacitance of an electrode, which is a crucial parameter used for quantifying the efficiency of supercapacitors. However, the values obtained from cyclic voltammetry can be significantly different from those extracted from electrochemical impedance spectroscopy analysis. This is particularly due to the fact that the interface does not behave like an ideal (i.e., frequency independent) capacitor, and requires the adoption of a constant phase element (CPE). In this article, we present the state of the art on this apparent difference and on the error that can result from one or the other technique using CPE analysis.

引用

页数：8

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