The reduction effect of oxygen functional groups in activated carbon for supercapacitor electrode
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Oxygen functional groups were removed from activated carbon in order to improve the electrochemical supercapacitor performance. Commercially available and surface-modified activated carbon electrodes were compared in non-aqueous electrolyte, which allowed stable experimentation at high voltages. N2-adsorption, FT-IR, and elemental analyzer were used to characterize the surface areas, pore volumes, surface chemical compositions, and oxygen content. Surface area and oxygen content were decreased by heat-treatment at high temperature. Despite the decreased surface area, both of the commercially available and surface-modified activated carbons showed similar specific capacitance of 18.6 Fcc-1 and 18.2 Fcc-1, respectively. Also electrochemical impedance spectra, stability at high voltage and cycle performance showed that surface-modified activated carbon had outstanding electrochemical performance due to the decrease in oxygen content of the commercial activated carbon.
Abstract
Oxygen functional groups were removed from activated carbon in order to improve the electrochemical supercapacitor performance. Commercially available and surface-modified activated carbon electrodes were compared in non-aqueous electrolyte, which allowed stable experimentation at high voltages. N2-adsorption, FT-IR, and elemental analyzer were used to characterize the surface areas, pore volumes, surface chemical compositions, and oxygen content. Surface area and oxygen content were decreased by heat-treatment at high temperature. Despite the decreased surface area, both of the commercially available and surface-modified activated carbons showed similar specific capacitance of 18.6 Fcc-1 and 18.2 Fcc-1, respectively. Also electrochemical impedance spectra, stability at high voltage and cycle performance showed that surface-modified activated carbon had outstanding electrochemical performance due to the decrease in oxygen content of the commercial activated carbon.
참고문헌 (8)
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