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Abstract
Despite the outstanding properties of pulsed laser-deposited carbon nanofoam including lightweight and self-standing structure, the lower specific capacitance and hence energy density are the main limitations to be used for electrochemical energy storage electrodes. In this research, we synthesized self-standing, porous, columnar, and micrometre-thick activated carbon nanofoam. The activated nanofoam aqueous supercapacitor delivers the areal (volumetric) capacitance of 95.37 mF/cm2 (18.32 F/cm3) at 2 mA retention of 103% at 20 mA, and the voltage obtained is 1V compared to pristine and annealed nanofoam supercapacitor. Such high capacitance retention of micrometer-thick KOH-activated carbon nanofoam even at high charge-discharge current is rarely reported and anticipates its promising potential for electrochemical energy storage application.
Supplementary materials
Title
Supporting Material
Description
Supporting Material contains additional scanning electron micrographs and energy-dispersive X-ray spectra of pristine nanofoam. Cyclic voltammogram at different scan rates, charge-discharge profile at different currents, plot of areal capacitance and cycle stability of all studied nanofoam.
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