Abstract
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·g−1 for the MnO2/MWNT electrode, and the specific capacitance of 127.2 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 0.5 mol·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·g−1 and 78.5 F·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.
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Acknowledgement
The authors acknowledge the financial support from the National Natural Science Foundation of China (number is 20701029). The authors gratefully acknowledge the helps of Mam X.Y. Zhang and Mr. X.Y. Ji, Analytical and Testing Center at Sichuan University, for the SEM micrographs and the XRD patterns.
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Chu, HY., Lai, QY., Wang, L. et al. Preparation of MnO2/WMNT composite and MnO2/AB composite by redox deposition method and its comparative study as supercapacitive materials. Ionics 16, 233–238 (2010). https://doi.org/10.1007/s11581-009-0378-5
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DOI: https://doi.org/10.1007/s11581-009-0378-5