Electrochemical reactivity of MnO2 in 1 M KOH studied by voltammetry and electrochemical impedance spectroscopy

被引：4

作者：

Benhaddad, L. ^{[1
]}

Makhloufi, L. ^{[1
]}

Messaoudi, B. ^{[1
]}

Rahmouni, K. ^{[2
]}

Takenouti, H. ^{[2
]}

机构：

[1] Univ A Mira, Dept Genie Proc, LTMGP, Route Targa Ouzemmour, Bejaia 06000, Algeria

[2] UPMC Univ Paris 06, LISE, CNRS, UPR 15, F-75252 Paris 05, France

来源：

MATERIAUX & TECHNIQUES | 2007年 / 95卷

关键词：

MnO2; EIS; reactivity; cavity microelectrode;

D O I：

10.1051/mattech:2008036

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The nanometric dimensions ofmanganese dioxideMnO 2 attract increasing interest of researchers. Its electrochemical reactivity depends generally on its crystalline structure, which vary with the method and the synthesis conditions. The present paper deals with the effect of oxidant used on the electrochemical reactivity of MnO2 synthesized by hydrothermal method. The obtained results by Scanning Electronic Microscopy showed the formation of spheres composed of many nanorods. Techniques such as cyclic voltammetry and electrochemical impedance spectroscopy were employed to investigate the electrochemical reactivity of the obtained MnO2 powders in 1 M KOH by using a cavity microelectrode. The results illustrate that the nano-structured MnO2 powder synthesized with the oxidant Na2S2O8 presents the highest electrochemical reactivity in this medium compared to the MnO2 obtained with the oxidant (NH4)(2)S2O8. The characterization of this powder by X-ray powder diffraction reveals the crystallographic variety.-MnO2 used as cathode in batteries.

引用

页码：405 / 410

页数：6

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