Chinese Journal of Applied Chemistry

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Three-dimensional Nanocomposite Array Supercapacitor Electrode Based on the Synergistic Effects of Manganese Dioxide and Metallorganic Frameworks

TANG Yanru1*, CHENG Baohai1, GAO Ying2, LI Yunhui2   

  1. (1.Faculty of Chemistry,Changchun Normal University,Changchun 130031,China;
    2.School of Chemistry and Environmental Engineering,Changchun University of
    Science and Technology,Changchun 130022,China)
  • Received:2013-10-18 Revised:2013-12-06 Published:2014-08-10 Online:2014-08-10
  • Contact: Yanru Tang

Abstract: ZnO-MnO2-MOF(metallorganic frameworks) nanocomposite array electrode was fabricated by multi-step chronopotentiometry and standing without disturbance, in which zinc nitrate, manganese nitrate and hexamethylenetetramine were the raw materials. The morphology and structure of the composite were investigated by scanning electron microscopy, transmission electron microscope, X-ray photoelectron spectroscopy, and X-ray diffraction, respectively. The electrochemical properties of the electrode were studied by cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy in 0.5 mol/L sodium sulfate. The results show that, in comparison with ZnO-MnO2 composite(Csp=121 F/g, j=2.5 A/g), ZnO-MnO2-MOF nanocomposite array electrode shows a lower internal resistance, a higher reversible Faradic reaction, and a better rate performance owing to synergistic effects between MnO2 and MOF, and its specific capacitance(Csp=146 F/g, j=2.5 A/g) is 20% higher than that of the ZnO-MnO2 composite.

Key words: manganese dioxide, metallorganic frameworks, supercapacitor, electrodeposition, nanocomposite electrode

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