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

06 June 2025, Version 2
Working Paper
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

Title
Description
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Title
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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Version History

Jun 06, 2025 Version 2

Version Notes

Added post-mortem analysis, elaboration of KOH activation, Raman fitting details, impedance spectra fitting.

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The content is available under CC BY 4.0 [opens in a new tab]

DOI

10.26434/chemrxiv-2025-vslch-v2
D O I: 10.26434/chemrxiv-2025-vslch-v2 [opens in a new tab]

Funding

Horizon Europe for the Marie Sklodowska-Curie Postdoctoral Fellowship
101067998-ENHANCER
Horizon Europe for the Marie Sklodowska-Curie Postdoctoral Fellowship
101065920 — SCCAMC
European Research Council
ERC CoG2016
Ministero dell’Università e della Ricerca (MUR)
CUP D43C22003090001

Author’s competing interest statement

The author(s) have declared they have no conflict of interest with regard to this content

Ethics

The author(s) have declared ethics committee/IRB approval is not relevant to this content

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