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Acta Phys. -Chim. Sin.  2009, Vol. 25 Issue (10): 1991-1997    DOI: 10.3866/PKU.WHXB20091025
Article     
Study on Meso-C/MnO2 Asymmetric Supercapacitors
SUN Zhe, LIU Kai-Yu, ZHANG Hai-Feng, LI Ao-Sheng, XU Xiao-Cun
School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China|Changsha Longtech Co. Ltd., Changsha 410083, P. R. China
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Abstract  

Mesoporous MnO2 and mesoporous carbon were prepared using silica mesoporous molecular sieves (SBA-15) as a hard template. A meso-C/MnO2 asymmetrical supercapacitor was assembled and characterized in 6 mol·L-1 KOHelectrolyte. Low X-ray diffraction (LXRD), transmission electron microscopy (TEM), and nitrogen adsorption-desorption results indicated that the as-prepared samples had mesoporous structures, large specific surface areas, and a narrow pore diameter distribution range. Galvanostatic charge/discharge, cyclic voltammetry, and AC (alternating current) impedance were used to investigate the electrochemical performance. At 0.1 A·g-1 current density, different potentials were applied to obtain the optimum cell voltage of 1.8 V. Under this condition, the supercapacitor exhibited good charge/discharge capacities. Results showed that the equivalent series resistance (ESR), power density, and energy density were 1.15 Ω, 89.0 W·kg-1, and 31.3 Wh·kg-1, respectively. The initial specific capacitance was 76.7 F·g-1 and 69.5 F·g-1 was obtained after 1000 cycles.



Key wordsAsymmetric supercapacitor      Mesoporous MnO2      Mesoporous carbon      Electrochemical performance     
Received: 13 May 2009      Published: 02 September 2009
MSC2000:  O646  
Corresponding Authors: LIU Kai-Yu     E-mail: kaiyuliu@263.net
Cite this article:

SUN Zhe, LIU Kai-Yu, ZHANG Hai-Feng, LI Ao-Sheng, XU Xiao-Cun. Study on Meso-C/MnO2 Asymmetric Supercapacitors. Acta Phys. -Chim. Sin., 2009, 25(10): 1991-1997.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB20091025     OR     http://www.whxb.pku.edu.cn/Y2009/V25/I10/1991

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