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• W4243438392 endingPage "01AH06" @default.
• W4243438392 startingPage "01AH06" @default.
• W4243438392 abstract "In this study, we investigate the electrochemical properties of graphene-based capacitors using cyclic voltammetry (CV), constant charge/discharge cycling, and electrochemical impedance spectroscopy combined with an equivalent circuit. An easy route incorporated with modified Hummers' method and microwave-assisted reduction is capable of preparing graphene nanosheets (GNs). Two types of capacitors fabricated with GN and graphene oxide (GO) powders are examined in 1 M H2SO4 within a potential of 0 and 0.8 V vs Ag/AgCl. The GO-based capacitor not only presents a better stable capacitance (ca. 211.7 F/g after 1000 cycles), but also a lower equivalent series resistance (ca. 7.6 Ω after 1000 cycles), when compared with the GN-based capacitor. The presence of surface oxides, attached to the edges or defects of the basal planes, imparts hydrophilic coverage for the formation of a double layer (double-layer capacitance) and active sites for reversible redox reaction (pseudocapacitance). When incorporated with structural (nanosheets) and chemical (surface oxides) factors, the GO powder serves as a promising electrode material for electrochemical capacitors or other energy-storage devices." @default.
• W4243438392 created "2022-05-12" @default.
• W4243438392 creator A5017465854 @default.
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• W4243438392 date "2012-01-01" @default.
• W4243438392 modified "2023-10-18" @default.
• W4243438392 title "Fabrication of Graphene-Based Electrochemical Capacitors" @default.
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• W4243438392 doi "https://doi.org/10.7567/jjap.51.01ah06" @default.
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