Abstract
The preparation of composite manganese dioxide (MnO2) nanoparticles in an ordered mesoporous carbon (CMK-3) matrix and its use for constructing a new wide-potential-window supercapacitor is reported. CMK-3 is prepared using mesoporous silica as a hard template and sucrose as carbon source. The different ratios of MnO2/CMK-3 composite is synthesized by impregnating CMK-3 with a Mn(NO3)2·4H2O solution followed by annealing in nitrogen. Physical properties, morphology, and specific surface area were characterized by X-ray diffraction, transmission electron microscopy, and nitrogen sorption measurements, respectively. The electrochemical properties of the composite were studied by cyclic voltammetry, galvanostatic charge/discharge measurements, and impedance spectroscopy in aqueous solution. A symmetric supercapacitor based on the 40 % MnO2/CMK-3 composite electrode shows a high operation voltage of 2.0 V and specific capacitances of 640 and 440 F g−1 at discharge current densities of 1 and 10 A g−1, respectively. Almost no significant decrease in specific capacity is observed after 10,000 cycles at different charge/discharge rates.
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Acknowledgments
This research is supported by the Iran National Science Foundation (research grant no. 90004915). The authors gratefully acknowledge Prof. A. Iraji Zad as head of the Institute for Nanoscience and Nanotechnology.
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Kiani, M.A., Khani, H. & Mohammadi, N. MnO2/ordered mesoporous carbon nanocomposite for electrochemical supercapacitor. J Solid State Electrochem 18, 1117–1125 (2014). https://doi.org/10.1007/s10008-013-2367-x
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DOI: https://doi.org/10.1007/s10008-013-2367-x