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

来源：

JOURNAL OF POWER SOURCES | 2008年 / 180卷 / 01期

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

页码：664 / 670

页数：7