Electrochemical properties of MnO2/activated carbon nanotube composite as an electrode material for supercapacitor

被引:153
作者
Ko, Jang Myoun [1 ]
Kim, Kwang Man [2 ]
机构
[1] Hanbat Natl Univ, Dept Appl Chem & Biotechnol, Taejon 305719, South Korea
[2] ETRI, Res Team Next Generat Energy Technol, Taejon 305700, South Korea
关键词
Activated carbon nanotube; Manganese oxide; Supercapacitor; Charge-discharge; HYDROUS RUTHENIUM OXIDE; MANGANESE OXIDE; HYDROTHERMAL SYNTHESIS; NANOSTRUCTURED MNO2; PERFORMANCE; DEPOSITION; FILMS; NANOCOMPOSITE; BEHAVIOR;
D O I
10.1016/j.matchemphys.2008.10.047
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Multi-walled carbon nanotubes (CNTs)were chemically activated using KOH in order to improve their specific surface area, electrical conductivity, and specific capacitance. Using such an activated CNT (A-CNT), a composite of MnO2/A-CNT was prepared by the coprecipitation method, and its physical and electrochemical properties were evaluated for use as an electrode material in supercapacitors. For comparison, a composite of MnO2/CNT was also prepared using an inactivated CNT and characterized in an aqueous solution of 1.0 M Na2SO4. The specific capacitances of the MnO2/A-CNT composite electrode, measured using cyclic voltammetry at scan rates of 10 and 100 mV s(-1), were found to be 250 and 184 Fg(-1), respectively, compared to 215 and 138 Fg(-1), respectively, for the MnO2/CNT composite electrode. Because of CNT activation, the MnO2/A-CNT composite electrode showed an improved performance in both the capacitance and cycle performance, due to the alleviation of the accumulated stress during charge-discharge cycling. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:837 / 841
页数:5
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