Electrochemical cyclability mechanism for MnO2 electrodes utilized as electrochemical supercapacitors

被引：133

作者：

Wei, Weifeng ^{[1
]}

Cui, Xinwei ^{[1
]}

Chen, Weixing ^{[1
]}

Ivey, Douglas G. ^{[1
]}

机构：

[1] Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 2G6, Canada

来源：

JOURNAL OF POWER SOURCES | 2009年 / 186卷 / 02期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Electrochemical supercapacitors; Manganese oxides; Electrochemical cyclability; Electrochemical impedance spectroscopy; Morphologicaland structural evolution; MANGANESE OXIDE; PSEUDOCAPACITANCE PROPERTIES; ANODIC ELECTRODEPOSITION; HYDROTHERMAL SYNTHESIS; BEHAVIOR; CAPACITORS; DEPOSITION; FILMS;

D O I：

10.1016/j.jpowsour.2008.10.058

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：

The electrochemical cyclability mechanism of nanocrystalline MnO2 electrodes with rock salt-type and hexagonal epsilon-type structures was investigated to determine the relationship between physicochemical feature evolution and the corresponding electrochemical behaviour of MnO2 electrodes. Rock salt MnO2 and hexagonal epsilon-MnO2 electrodes, with fibrous and porous morphologies, evolve into the antifluorite-type MnO2 with a petal-shaped nanosheet structure after electrochemical cycling, similar to that observed in nanocrystalline antifluorite-type MnO2 electrodes after electrochemical cycling. However, a different impedance response was observed for the rock salt MnO2 and hexagonal epsilon-MnO2 electrodes during the charge-discharge cycles, compared with the improved impedance response observed for the cycled antifluorite-type MnO2. A dissolution-redeposition mechanism is proposed to account for the impedance response of the MnO2 electrodes with different morphologies and crystal structures. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：543 / 550

页数：8

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