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http://dx.doi.org/10.7464/ksct.2018.24.3.183

Electrochemical Properties of Using MnO2-HCS Composite for Supercapacitor  

Jin, En Mei (Department of Chemical Engineering, Chungbuk National University)
Jeong, Sang Mun (Department of Chemical Engineering, Chungbuk National University)
Publication Information
Clean Technology / v.24, no.3, 2018 , pp. 183-189 More about this Journal
Abstract
Hollow carbon spheres (HCS) and carbon spheres (CS) were prepared by a hydrothermal reaction and they were introduced as a substrate for the deposition of $MnO_2$ nanoparticles. The $MnO_2$ nanoparticles were deposited on the carbon surface by a chemical redox deposition method. After deposition, the $MnO_2$ nanoparticles were uniformally distributed on the carbon surface in a slit-shape, and sparse $MnO_2$ slits appeared on the HCS surface. The $MnO_2-HCS$ showed an initial specific capacitance of $164.1F\;g^{-1}$ at scan rate of $20mv\;s^{-1}$, and after 1,000 cycles, the specific capacitance was maintained to $141.3F\;g^{-1}$. The capacity retention of $MnO_2-HCS$ and $MnO_2-CS$ were calculated to 86% and 78% in the cycle performance test up to 1,000 cycles, respectively. $MnO_2-HCS$ showed a good cycle stability due to the mesoporous hollow structure which can cause a faster diffusion of the electrolyte and can easily adsorb and desorb $Na^+$ ions on the surface of the electrode.
Keywords
Hollow carbon; $MnO_2$; Chemical reduction deposition; Supercapacitor;
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Times Cited By KSCI : 2  (Citation Analysis)
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