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Hierarchical porous carbon derived from eucalyptus-bark as a sustainable electrode for high-performance solid-state supercapacitors

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Abstract

We report the synthesis and characterization of novel activated carbon derived from waste eucalyptus bark through chemical and physical activation processes to use as a potential electrode for symmetric electrical double layer capacitors (EDLCs). A porous polymer film prepared by a 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 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 eco-friendly, safe, and flexible EDLCs. The derived AC powder possesses a hierarchical porous interior having micro- and meso-porosity. An EDLC, constructed using the optimized AC, shows a high specific capacitance of ∼155 F g−1 and offers a better rate capability than commercial AC-based devices. 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 W h 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.

Graphical abstract: Hierarchical porous carbon derived from eucalyptus-bark as a sustainable electrode for high-performance solid-state supercapacitors

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Article information


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

Sustainable Energy Fuels, 2020, Advance Article
Article type
Paper

Hierarchical porous carbon derived from eucalyptus-bark as a sustainable electrode for high-performance solid-state supercapacitors

N. Yadav, Ritu, Promila and S. A. Hashmi, Sustainable Energy Fuels, 2020, Advance Article , DOI: 10.1039/C9SE00812H

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