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MnO2/ordered mesoporous carbon nanocomposite for electrochemical supercapacitor

Kiani, M. A ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1007/s10008-013-2367-x
  3. Abstract:
  4. 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)2·4H 2O 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
  5. Keywords:
  6. High-voltage supercapacitor ; Capacitors ; Carbon ; Cyclic voltammetry ; Mesoporous materials ; Nitrogen ; Specific surface area ; Transmission electron microscopy ; X ray diffraction ; Aqueous electrolyte ; Discharge current density ; Electrochemical supercapacitor ; Galvanostatic charge/discharge ; Manganese dioxide ; Mesoporous carbon nanocomposites ; Ordered mesoporous carbon ; Super capacitor ; Manganese oxide
  7. Source: Journal of Solid State Electrochemistry ; Vol. 18, issue. 4 , 2014 , pp. 1117-1125
  8. URL: http://link.springer.com/article/10.1007%2Fs10008-013-2367-x