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Hierarchical porous carbon derived from eucalyptus-bark as sustainable electrodes for high-performance solid-state supercapacitor

Abstract

We report the synthesis and characterization of a novel activated carbon derived from waste eucalyptus bark through chemical and physical activation processes to use as potential electrode for symmetric electrical double layer capacitors (EDLCs). A porous polymer film prepared by simple phase-inversion method and activated by an ionic liquid electrolyte has been used as a flexible, high ion-conducting, mechanically and electrochemically stable electrolyte for the EDLCs. The use of waste eucalyptus bark to produce activated carbon (AC) with a straightforward activation process, and a simple phase-inversion method to produce porous polymer electrolytes (PPEs), make possible the preparation of ecofriendly, safe, and flexible EDLCs. The derived AC powder, possesses a hierarchical porous interior having micro- and meso-porosity. EDLC, constructed using the optimized AC, shows high specific capacitance of 155 F g-1, and offers better rate capability than commercial AC-based device. EIS studies reveal superior charge-transfer characteristics of optimized AC electrodes, as compared to the commercial AC. Galvanostatic charge-discharge measurements highlight the high specific energy and maximum power (32.8 Wh kg-1 and 57 kW kg-1, respectively) of the optimized AC based EDLC. This device maintains its performance for at least 10,000 charge-discharge cycles with high (96%) capacitance retention.

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Supplementary files

Article information


Submitted
17 Sep 2019
Accepted
19 Dec 2019
First published
07 Jan 2020

Sustainable Energy Fuels, 2020, Accepted Manuscript
Article type
Paper

Hierarchical porous carbon derived from eucalyptus-bark as sustainable electrodes for high-performance solid-state supercapacitor

N. Yadav, R. No last name, P. No last name and S. A. Hashmi, Sustainable Energy Fuels, 2020, Accepted Manuscript , DOI: 10.1039/C9SE00812H

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