共 21 条
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.
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页码:664 / 670
页数:7
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