Interpretation of the impedance comprising negative capacitance and constant phase elements on iron electrode in weakly acidic media

被引：17

作者：

Elkin, V. V. ^{[1
]}

Marshakov, A. I. ^{[1
]}

Rybkina, A. A. ^{[1
]}

Maleeva, M. A. ^{[1
]}

机构：

[1] Russian Acad Sci, Frumkin Inst Phys Chem & Electrochem, Moscow 119071, Russia

来源：

RUSSIAN JOURNAL OF ELECTROCHEMISTRY | 2011年 / 47卷 / 02期

关键词：

impedance spectroscopy; impedance of the iron electrode in acid; negative capacitance; constant phase element; ANODIC-DISSOLUTION; REACTION MODEL; SULFATE; ELECTROCRYSTALLIZATION; MECHANISM; CHLORIDE; KINETICS; NICKEL;

D O I：

10.1134/S1023193511020054

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The negative low-frequency capacitance that appears in interpretations of impedance of the iron electrode in weakly acidic solutions is shown to arise in the case of interaction of two consecutive nonequilibrium flows that constitute a two-stage anodic faradaic process of intermediate adsorption in the prepassivation potential range. The low-frequency capacitance is negative throughout a potential range where the logarithm of rate constant vs. potential (logk vs. E) dependence has the higher slope for the limiting stage. The low-frequency capacitance becomes positive at higher anodic potentials and for the other limiting stage.

引用

页码：136 / 146

页数：11