期刊
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
卷 18, 期 4, 页码 1117-1125出版社
SPRINGER
DOI: 10.1007/s10008-013-2367-x
关键词
High-voltage supercapacitor; Ordered mesoporous carbon; Manganese dioxide; Aqueous electrolyte
资金
- Iran National Science Foundation [90004915]
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)center dot 4H(2)O 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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