Authors: HongYan Chu QiongYu Lai Ling Wang JianFang Lu Yan Zhao
Publish Date: 2009/09/15
Volume: 16, Issue: 3, Pages: 233-238
Abstract
The manganese oxide/multiwalled 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 Xray 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 1823 F·g−1 for the MnO2/MWNT electrode and the specific capacitance of 1272 F·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·g−1 in 05 mol·L−1 potassium sulfate electrolyte solution in the first cycle The specific capacitance of both the MnO2/MWNT and MnO2/AB electrodes were 1412 F·g−1 and 785 F·g−1 after 1200 cycles respectively The MnO2/MWNT electrode has better cycling performance The effect of different morphologies was investigated for both MnO2/MWNT and MnO2/AB compositesThe authors acknowledge the financial support from the National Natural Science Foundation of China number is 20701029 The authors gratefully acknowledge the helps of Mam XY Zhang and Mr XY Ji Analytical and Testing Center at Sichuan University for the SEM micrographs and the XRD patterns
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