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Citation: DENG Lingjuan, GU Yuanzi, XU Weixia, ZHANG Zhixia. Preparation of Clew-like MnO₂ with Layered Structure as High-performance Asymmetric Electrochemical Capacitor Electrodes[J]. Chinese Journal of Applied Chemistry, ;2014, 31(1): 76-83. doi: 10.3724/SP.J.1095.2014.30098 shu

Preparation of Clew-like MnO₂ with Layered Structure as High-performance Asymmetric Electrochemical Capacitor Electrodes

1.
School of Chemistry & Chemical Engineering, Xianyang Normal University, Xianyang 712000, China

Corresponding author: DENG Lingjuan,
Received Date: 25 February 2013
Available Online: 26 March 2013
Fund Project: 咸阳师范学院专项科研基金(12XSYK027,12XSYK029)资助 (12XSYK027,12XSYK029)

Clew-like MnO₂(CMnO₂) with a specific capacitance of 154 F/g within a potential window of 0~1.0 V vs saturated calomel electrode has been synthesized by hydrothermally treating the precursor of as synthesized MnO₂ in a solution of 1 mol/L NaOH at 150℃ for 12 h.The morphology and structure of the obtained material were examined by XRD,SEM and N₂ adsorption-desorption.The capacitive properties were characterized by cyclic voltammetry,galvanostatic charge-discharge and electrochemical impedance spectroscopies.An asymmetrical electrochemical capacitor(EC) was assembled using CMnO₂ as the positive electrode and graphene(GR) as the negative electrode,respectively.The asymmetrical EC can cycle reversibly in a cell potential of 0~1.8 V and gives a high energy density of 21.6 W·h/kg,which is much higher than those of symmetrical ECs based on CMnO₂(4.86 W·h/kg) and GR(4.3 W·h/kg).Moreover,the asymmetrical EC presents a high power density(9 kW/kg at 8.1 W·h/kg) and excellent cycling performance of 83% retention after 1000 cycles.
- asymmetrical electrochemical capacitor,
- manganese dioxide,
- graphene,
- energy density,
- cycle stability
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Preparation of Clew-like MnO2 with Layered Structure as High-performance Asymmetric Electrochemical Capacitor Electrodes

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通讯作者: 陈斌, bchen63@163.com

Preparation of Clew-like MnO₂ with Layered Structure as High-performance Asymmetric Electrochemical Capacitor Electrodes