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Browsing by Author "Hong, Jing-Ru"

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    Synthesis of Petal-Like Carbon Nanocapsule@MnO2 Core-Shell Particles and Their Application in Supercapacitors
    (2014)
    Lee, Ting-Ting
    ;
    Hong, Jing-Ru
    ;
    Lin, Wei-Chen
    ;
    Hu, Chi-Chang
    ;
    Wu, Pu-Wei
    Carbon nanocapsule (CNC)@MnO2 core-shell particles are prepared with a reaction of KMnO4 with CNC at 90 degrees C. Birnessite-type MnO2 nanoflakes are grown on CNC seeds, resulting in CNC@MnO2 particles with a petal-like structure. The electrochemical characteristics of the prepared materials show that the highest specific capacitance (163 Fg(-1)) was obtained with a scan rate of 2 mVs(-1) in 1 M Na2SO4. In addition, the synthesized material has superior cycling stability. The capacitance retains 97.8% of its initial value after 5000 cycles with a scan rate of 100 mVs(-1). (C) 2014 The Electrochemical Society. All rights reserved.