A hierarchical porous MnO2-based electrode for electrochemical capacitor

被引：16

作者：

Xue, Leigang ^{[1
]}

Hao, Hao ^{[1
]}

Wei, Zhen ^{[1
]}

Huang, Tao ^{[1
]}

Yu, Aishui ^{[1
]}

机构：

[1] Fudan Univ, Inst New Energy, Shanghai Key Lab Mol Catalysis & Innovat Mat, Dept Chem, Shanghai 200438, Peoples R China

来源：

JOURNAL OF SOLID STATE ELECTROCHEMISTRY | 2011年 / 15卷 / 03期

基金：

国家高技术研究发展计划(863计划);

关键词：

Manganese dioxide; Three-dimensional porous current collector; Utilization efficiency; Electrochemical capacitor; MESOPOROUS MNO2; OXIDE; SUPERCAPACITOR; BEHAVIOR;

D O I：

10.1007/s10008-010-1108-7

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

A hierarchical porous MnO2-based electrode was prepared and its electrochemical performance for electrochemical capacitors was investigated. In this work, porous MnO2 film with pore size of 2-3 nm in diameter was deposited on a three-dimensional porous current collector by cathodic electrodeposition associated with subsequent controlled heat treatment at 200A degrees C for 2 h. Transmission electron microscopy and X-ray photoelectron spectroscopy showed that the heat treatment has a great effect on the formation of the porous structure of MnO2 layer, and the disordered porous structure was caused by dehydration during the heat treatment. Cyclic voltammetry and galvanostatic charge-discharge tests showed that both energy and power densities are enhanced due to the unique hierarchical porous structure. The electrode delivers a high specific capacitance of 385 F g(-1) at a high current density of 5 A g(-1) within a potential window of -0.05 similar to aEuro parts per thousand 0.85 V, and also exhibits excellent rate capability and electrochemical stability.

引用

页码：485 / 491

页数：7

共 28 条

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