Volume 32, Issue 12 p. 2946-2957
Full Paper

Physicochemical Properties of Nitrogen Doped Carbon Nano-onions Grown by Flame Pyrolysis from Grapeseed Oil for Use in Supercapacitors

Bokome Shaku

Bokome Shaku

DSI-NRF Centre of Excellence in Strong Materials, School of Chemistry, University of the Witwatersrand, Private Bag 3, Johannesburg, 2050 South Africa

Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, Johannesburg, 2050 South Africa

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Thapelo P. Mofokeng

Thapelo P. Mofokeng

DSI-NRF Centre of Excellence in Strong Materials, School of Chemistry, University of the Witwatersrand, Private Bag 3, Johannesburg, 2050 South Africa

Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, Johannesburg, 2050 South Africa

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Thomas H. Mongwe

Thomas H. Mongwe

DSI-NRF Centre of Excellence in Strong Materials, School of Chemistry, University of the Witwatersrand, Private Bag 3, Johannesburg, 2050 South Africa

Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, Johannesburg, 2050 South Africa

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Neil J. Coville

Neil J. Coville

DSI-NRF Centre of Excellence in Strong Materials, School of Chemistry, University of the Witwatersrand, Private Bag 3, Johannesburg, 2050 South Africa

Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, Johannesburg, 2050 South Africa

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Kenneth I. Ozoemena

Kenneth I. Ozoemena

DSI-NRF Centre of Excellence in Strong Materials, School of Chemistry, University of the Witwatersrand, Private Bag 3, Johannesburg, 2050 South Africa

Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, Johannesburg, 2050 South Africa

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Manoko S. Maubane-Nkadimeng

Corresponding Author

Manoko S. Maubane-Nkadimeng

DSI-NRF Centre of Excellence in Strong Materials, School of Chemistry, University of the Witwatersrand, Private Bag 3, Johannesburg, 2050 South Africa

Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, Johannesburg, 2050 South Africa

Microscopy and Microanalysis Unit, University of the Witwatersrand, Private Bag 3, Johannesburg, 2050 South Africa

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First published: 04 October 2020
Citations: 10

Abstract

A low cost synthesis of catalyst free carbon nano-onions (CNOs) and nitrogen post doped CNOs (N−CNOs) using grapeseed oil is reported. Successful incorporation of nitrogen atoms into the lattice of CNOs was confirmed by XPS, resulting in 1.7 % nitrogen content. BET and Raman analysis showed an increase in the specific surface area and the ID/IG ratio of carbon, respectively after N incorporation. The specific capacitance of the CNOs increased upon nitrogen doping and as a result, N−CNOs exhibited superior electrochemical performance compared to pristine CNOs. Our results demonstrate that N−CNOs are a promising electrode material for energy storage in supercapacitors.

Data Availability Statement

The data that supports the findings of this study are available in the supplementary material of this article.