Electrochemical properties of nanosized hydrous manganese dioxide synthesized by a self-reacting microemulsion method

被引:145
作者
Xu, Chengjun [1 ,2 ]
Li, Baohua [2 ]
Du, Hongda [2 ]
Kang, Feiyu [1 ]
Zeng, Yuqun [3 ]
机构
[1] Tsinghua Univ, Dept Mat Sci & Engn, Beijing 100084, Peoples R China
[2] Tsinghua Univ, Grad Sch Shenzhen, Adv Mat Inst, Shenzhen 518055, Guangdong, Peoples R China
[3] Amperex Technol Ltd, Dongguan 523080, Guangdong, Peoples R China
关键词
manganese dioxide; self-reacting microemulsion; pseudo-capacitance; supercapacitor;
D O I
10.1016/j.jpowsour.2008.02.029
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
Manganese dioxide has been synthesized by a new simple self-reacting microemulsion method. The synthesized MnO2 has been found to be amorphous structure containing a moderate amount of water by X-ray diffraction, Fourier transform infrared spectroscopy and thermogravimetric analysis. Particles in a spherical shape with about 4 nm in diameter have been observed by transmission electron microscopy. Cyclic voltammetic tests have been performed between -0.5 and 0.5 V versus Hg/Hg2SO4 in 1 mol L-1 Na2SO4 solution at sweep rates up to 50 mV s(-1). A specific capacitance value as high as 246.2 F g(-1) was obtained, which was much higher than 146.5 Fg(-1) of MnO2 prepared by chemical co-precipitation. After 600 cycles, only 6% decrease of specific capacitance was measured which indicated that such a material possesses good cycling property. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:664 / 670
页数:7
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