PREPARATION OF ACTIVATED CARBON MONOLITH ELECTRODES FROM SUGARCANE BAGASSE BY PHYSICAL AND PHYSICAL-CHEMICAL ACTIVATION PROCESS FOR SUPERCAPACITOR APPLICATION
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Date
2014-07-02
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Abstract
Binderless activated carbon monoliths (ACMs) for supercapacitor electrodes were
prepared from sugarcane bagasse by two different methods of physical and combination of
physical-chemical activation process. The CO2 gas was used as physical activation agent and 0.3 M
KOH was chosen as chemical activation agent. The ACMs were tested as electrodes in twoelectrode
systems of the coin tape cell supercapacitor that consists of stainless steel as current
collectors and 1 M H2SO4 as an electrolyte. The improving of resistive, capacitive and energy
properties of combination of physical-chemical ACMs electrodes were shown by an impedance
spectroscopy, a cyclic voltammetry and a galvanostatic charge-discharge method. The improving of
resistive, capacitive and energy properties as high as 1 to 0.6 Ω, 141 to 178 F g-1, 3.83 to 4.72 W h
kg-1, respectively. The X-ray diffraction analysis and field emission scanning electron microscope
were performed to characterize the crystallite and morphology characteristics. The results showed
that the combination of physical-chemical activation process have given a good improving in
performance of the bagasse based ACMs electrodes in supercapacitor application