KOH-Activated Micrometer-Thick Amorphous Carbon Nanofoam as Binder-Free Supercapacitor Electrode with High-Rate Performance

06 June 2025, Version 2
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

In this communication, we demonstrate an aqueous supercapacitor based on self-standing, porous, columnar, and 26 μm thick activated carbon nanofoam. The device delivers areal (volumetric) capacitance of 95.4 mF/cm2 (18.3 F/cm3) at 2 mA with retention of 103% at 20 mA and achieves 1V voltage compared to pristine and annealed ones.

Keywords

nanocarbons
amorphous carbon
supercapacitor

Supplementary materials

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Supporting Material
Description
Supporting Material contains synthesis methods, characterization techniques, additional scanning electron micrographs and energy-dispersive X-ray spectra of pristine nanofoam, Post-mortem characterizations, Raman fitting details, and Cyclic voltammogram at different scan rates, charge-discharge profile at different currents, plot of areal capacitance, cycle stability and impedance spectra fitting details of all studied nanofoam devices.
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