| Effect of Ni-doping on electrochemical capacitance of MnO2 electrode materials |
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| 作者姓名： | 张治安 赖延清 李劼 刘业翔 |
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| 作者单位： | School of Metallurgical Science and Engineering Central South University，School of Metallurgical Science and Engineering Central South University，School of Metallurgical Science and Engineering Central South University，School of Metallurgical Science and Engineering Central South University，Changsha 410083 China，Changsha 410083 China，Changsha 410083 China，Changsha 410083 China |
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| 摘 要： | Mn/Ni composite oxides as active electrode materials for supercapacitors were prepared by solid-state reaction through the reduction of KMnO4 with manganese acetate and nickel acetate at low temperature. The products were characterized by X-ray diffractometry(XRD) and transmission electron microscopy(TEM). The electrochemical characterizations were performed by cyclic voltammetry (CV) and constant current charge-discharge in a three-electrode system. The effects of different potential windows, scan rates, and cycle numbers on the capacitance behavior of Mn0.8Ni0.2Ox composite oxide were also investigated. The results show that the composite oxides are of nano-size and amorphous structure. With increasing the molar ratio of Ni, the specific capacitance goes through a maximum at molar fraction of Ni of 20%. The specific capacitance of Mn0.8Ni0.2Ox composite oxide is 194.5 F/g at constant current discharge of 5 mA.
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| 关 键 词： | MnO2 电容 掺杂质 复合物 电子材料 |
| 收稿时间： | 10 March 2007 |
| 修稿时间： | 2007-03-10 |
Effect of Ni-doping on electrochemical capacitance of MnO2 electrode materials |
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| Zhang Zhi-an , Lai Yan-qing , Li Jie and Liu Ye-xiang.Effect of Ni-doping on electrochemical capacitance of MnO2 electrode materials[J].Journal of Central South University of Technology,2007,14(5):638-642. |
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| Authors: | Zhang Zhi-an Lai Yan-qing Li Jie and Liu Ye-xiang |
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| Affiliation: | School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China |
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| Abstract: | Mn/Ni composite oxides as active electrode materials for supercapacitors were prepared by solid-state reaction through the reduction of KMnO4 with manganese acetate and nickel acetate at low temperature. The products were characterized by X-ray diffractometry(XRD) and transmission electron microscopy(TEM). The electrochemical characterizations were performed by cyclic voltammetry (CV) and constant current charge-discharge in a three-electrode system. The effects of different potential windows, scan rates, and cycle numbers on the capacitance behavior of Mn0.8Ni0.2Ox composite oxide were also investigated. The results show that the composite oxides are of nano-size and amorphous structure. With increasing the molar ratio of Ni, the specific capacitance goes through a maximum at molar fraction of Ni of 20%. The specific capacitance of Mn0.8Ni0.2Ox composite oxide is 194.5 F/g at constant current discharge of 5 mA. |
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| Keywords: | MnO2 supercapacitor capacitance Ni doping composite oxide |
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