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Supercapacitive Properties of Carbon-Nano Fiber/MnO2 Composite Electrode  

Lee, Byung Jun (Division of Applied Chemistry and Biotechnology, Hanbat National University)
Yoon, Yu Il (Division of Applied Chemistry and Biotechnology, Hanbat National University)
Ko, Jang Myoun (Division of Applied Chemistry and Biotechnology, Hanbat National University)
Publication Information
Korean Chemical Engineering Research / v.46, no.1, 2008 , pp. 94-98 More about this Journal
Abstract
In order to improve the specific capacitance of amorphous hydrous manganese oxide ($MnO_2$) for supercapacitors, it is made into composites with vapour-grown carbon nanofibers (VGCF) having the VGCF ratio as 40 wt% in the composites. The electrochemical properties of these composites are investigated in 1.0 M $Na_2SO_4$ by cyclic voltammetry (CV), impedance measurements and chronopotentiometric charger/discharger. The composite with 40 wt% VGCF shows the superior electrochemical performance, whose specific capacitance (based on the mass of $MnO_2$, $0.8mg/cm^2$) is 380 F/g at 20 mV/s and 230 F/g at 500 mV/s. Also, the cycle-life testing of this electrode carried out for 3,000 charge/discharge cycles at $2.0mA/cm^2$ shows 97% capacitance retention.
Keywords
Supercapacitor; Metal Oxides; Composite Electrode Carbon Nanofiber; Capacitance;
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