Preparation of MnO2/WMNT composite and MnO2/AB composite by redox deposition method and its comparative study as supercapacitive materials
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- 作者：Hong-Yan Chu (1)
Qiong-Yu Lai (1) laiqy5@hotmail.com
Ling Wang (1)
Jian-Fang Lu (1)
Yan Zhao (1) - 关键词：MnO2/MWNT composite ; MnO2/AB composite ; Comparative study ; Supercapacitor
- 刊名：Ionics
- 出版时间：April 2010
- 出版年：2010
- 期刊代码：pc345_0947-7047
- 类别：ch
- 卷：16
- 期：3
- 页码：233-238
- 数据来源：sp
摘要
The manganese oxide/multi-walled carbon nanotube (MnO2/MWNT) composite and the manganese oxide/acetylene black (MnO2/AB) composite were prepared by translating potassium permanganate into MnO2 which formed the above composite with residual carbon material using the redox deposition method and carbon as a reducer. The products were characterized by X-ray diffraction, Fourier transform infrared, and scanning electron microscope. Electrochemical properties of both the MnO2/MWNT and MnO2/AB electrodes were studied by using cyclic voltammetry, electrochemical impedance measurement, and galvanostatic charge/discharge tests. The results show that the MnO2/MWNT electrode has better electrochemical capacitance performance than the MnO2/AB electrode. The charge–discharge test showed the specific capacitance of 182.3 F路g−1 for the MnO2/MWNT electrode, and the specific capacitance of 127.2 F路g−1 for the MnO2/AB electrode had obtained, within potential range of 0–1 V at a charge/discharge current density of 200 mA路g−1 in 0.5 mol路L−1 potassium sulfate electrolyte solution in the first cycle. The specific capacitance of both the MnO2/MWNT and MnO2/AB electrodes were 141.2 F路g−1 and 78.5 F路g−1 after 1,200 cycles, respectively. The MnO2/MWNT electrode has better cycling performance. The effect of different morphologies was investigated for both MnO2/MWNT and MnO2/AB composites.