| Charge-discharge process of MnO2 supercapacitor |
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| 作者姓名： | 刘开宇 张莹 张伟 郑禾 苏耿 |
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| 作者单位： | [1]School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China; [2]State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China |
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| 摘 要： | Mechanochemical synthesis of α-MnO2 was carried out with KMnO4 and Mn（CH3COO）2 in 1：1 mole ratio. The electrochemical performance of MnO2 electrode was investigated by cyclic voltammograms and alternating current impedance. The charge-discharge process of MnO2 supercapacitor in 6 mol/L KOH was studied within 1.2 V at 200 mA/g, suggesting that it displays double-layer capacibility in low potential scope and pseudo-capacitance properties in high potential scope. It is found that Mn3O4, an electrochemical inert, mainly forms in the initial 40 charge-discharge cycles. During cycling, the pseudo-capacitance properties disappear and the discharge curves are close to ideal ones, indicating double-layer capability. The maximum capacitance of MnO2 electrode is as high as 416 F/g, and retains 240 F/g after 200 cycles. The equivalent series resistance increases from 17 to 41Ω.
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| 关 键 词： | 二氧化锰 电容 双层容量 放电 |
| 收稿时间： | 15 September 2006 |
| 修稿时间： | 2006-09-152006-11-24 |
Charge-discharge process of MnO2 supercapacitor |
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| LIU Kai-yu,ZHANG Ying,ZHANG Wei,ZHENG He,SU Geng.Charge-discharge process of MnO2 supercapacitor[J].Transactions of Nonferrous Metals Society of China,2007,17(3):649-653. |
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| Authors: | LIU Kai-yu ZHANG Ying ZHANG Wei ZHENG He SU Geng |
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| Affiliation: | 1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China; 2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China |
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| Abstract: | Mechanochemical synthesis of α-MnO2 was carried out with KMnO4 and Mn(CH3COO)2 in 1:1 mole ratio. The electrochemical performance of MnO2 electrode was investigated by cyclic voltammograms and alternating current impedance. The charge-discharge process of MnO2 supercapacitor in 6 mol/L KOH was studied within 1.2 V at 200 mA/g, suggesting that it displays double-layer capacibility in low potential scope and pseudo-capacitance properties in high potential scope. It is found that Mn3O4, an electrochemical inert, mainly forms in the initial 40 charge-discharge cycles. During cycling, the pseudo-capacitance properties disappear and the discharge curves are close to ideal ones, indicating double-layer capability. The maximum capacitance of MnO2 electrode is as high as 416 F/g, and retains 240 F/g after 200 cycles. The equivalent series resistance increases from 17 to 41 Ω. |
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| Keywords: | manganese dioxide supercapacitor pseudo-capacitance double-layer capability charge-discharge process |
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