Electrochemical properties of manganese oxide coated onto carbon nanotubes for energy-storage applications

被引：267

作者：

Ma, Sang-Bok ^{[1
]}

Nam, Kyung-Wan ^{[2
]}

Yoon, Won-Sub ^{[2
]}

Yang, Xiao-Qing ^{[2
]}

Ahn, Kyun-Young ^{[3
]}

Oh, Ki-Hwan ^{[4
]}

Kim, Kwang-Bum ^{[1
]}

机构：

[1] Yonsei Univ, Dept Mat Sci & Engn, Seoul 120749, South Korea

[2] Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA

[3] Hyundai ECO Technol Res Inst, Yongin 446912, Gyeonggi Do, South Korea

[4] Seoul Natl Univ, Next Generat Vehicle Technol, Seoul 151742, South Korea

来源：

JOURNAL OF POWER SOURCES | 2008年 / 178卷 / 01期

关键词：

manganese oxide; carbon nanotube; nanocomposite; electrochemical capacitor;

D O I：

10.1016/j.jpowsour.2007.12.027

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：

Birnessite-type manganese dioxide (MnO2) is Coated uniformly on carbon nanotubes (CNTs) by employing a spontaneous direct redox reaction between the CNTs and permanganate ions (MnO4-). The initial specific capacitance of the MnO2/CNT nanocomposite in an organic electrolyte at a large current density of 1 A g(-1) is 250 F g(-1). This is equivalent to 139 mAh g(-1) based on the total weight of the electrode material that includes the electroactive material, conducting agent and binder. The specific capacitance of the MnO2 in the MnO2/CNT nanocomposite is as high as 580 F g(-1) (320 rnAh g(-1)), indicating excellent electrochemical utilization of the MnO2. The addition of CNTs as a conducting agent improves the high-rate capability of the MnO2/CNT nanocomposite considerably. The in situ X-ray absorption near-edge structure (XANES) shows improvement in the structural and electrochemical reversibility of the MnO2/CNT nanocomposite after heat-treatment. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：483 / 489

页数：7

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