Superior supercapacitance behavior of oxygen self-doped carbon nanospheres: a conversion of Allium cepa peel to energy storage system

Ali, Gomaa A. M. and S., Supriya and Chong, Kwok Feng and Shaaban, Essam R. and H., Algarni and T., Maiyalagan and Hegde, Gurumurthy (2021) Superior supercapacitance behavior of oxygen self-doped carbon nanospheres: a conversion of Allium cepa peel to energy storage system. Biomass Conversion and Biorefinery, 11. pp. 1311-1323. ISSN 2190-6823. (Published)

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DOI/Official URL: https://doi.org/10.1007/s13399-019-00520-3

Abstract

Mesoporous carbon nanospheres are produced from biowaste, Allium cepa peels, well known as “onion” dry peels using the catalyst-free pyrolysis method. The synthesis process involves an unusable bio-precursor that is accumulated in millions of tons per year. The obtained materials show nanosphere morphology with particles size of 63–66 nm and surface area up to 2962 m2 g−1. After pyrolysis at 800, 900, and 1000 °C, the carbon nanospheres are directly applied for supercapacitance study without further activation processes. The electrochemical studies show promising results such as high electrode capacitance of 189.4 at 0.1 A g−1 in 3 M KOH. Moreover, full cell symmetrical supercapacitor is fabricated and further investigated under a wide potential window up to 1.6 V. An excellent electrochemical behavior is observed for the supercapacitor in terms of high energy density of 22.1 Wh kg−1 at a power density of 39.6 W kg−1, high cyclic stability of 78%, and high coulombic efficiency of 90% over 4500 cycles at 0.5 A g−1. These studies support carbon nanospheres obtained from Allium cepa wastes to be used as promising materials for supercapacitor application.

Item Type:	Article
Uncontrolled Keywords:	Supercapacitor, Onion peel, Agricultural waste, Carbon nanospheres, Specific capacitance
Subjects:	Q Science > QD Chemistry
Faculty/Division:	Faculty of Industrial Sciences And Technology
Depositing User:	Dr. Chong Kwok Feng
Date Deposited:	27 May 2022 08:56
Last Modified:	27 May 2022 08:56
URI:	http://umpir.ump.edu.my/id/eprint/33963
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