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Partial Oxidation to Extend the Lifetime of Nanoporous Carbon in an Ultracapacitor with Li(2)SO(4) Electrolyte

A TiC-derived carbon (CDC) and its partially oxidized derivative (ox-red-CDC), oxidized by a modified Hummers method, were studied as promising electrode materials for electrochemical energy storage. To evaluate the electrochemical properties of the carbon materials, cyclic voltammetry, galvanostati...

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Autores principales: Käärik, Maike, Arulepp, Mati, Leis, Jaan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10096144/
https://www.ncbi.nlm.nih.gov/pubmed/37049709
http://dx.doi.org/10.3390/molecules28072944
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author Käärik, Maike
Arulepp, Mati
Leis, Jaan
author_facet Käärik, Maike
Arulepp, Mati
Leis, Jaan
author_sort Käärik, Maike
collection PubMed
description A TiC-derived carbon (CDC) and its partially oxidized derivative (ox-red-CDC), oxidized by a modified Hummers method, were studied as promising electrode materials for electrochemical energy storage. To evaluate the electrochemical properties of the carbon materials, cyclic voltammetry, galvanostatic cycling, and electrochemical impedance spectroscopy measurements were performed in 1 M Li(2)SO(4) using 2- and 3-electrode cells. A partially oxidized surface was shown to improve the capacitance and electrochemical stability of a nanoporous CDC at positive potential values. The respective anodic capacitance of 80 F cm(−3) reveals a 15% improvement over the non-oxidized CDC. At negative potential values, the capacitance of two carbon materials is almost equal, 97 vs. 93 F cm(−3), for the non-oxidized and partially oxidized CDC materials, respectively. An asymmetric 2-electrode ultracapacitor containing ox-red-CDC as the anode and pristine CDC as the cathode demonstrated an excellent cycle life. The temporary repolarization of the 2-electrode cell after thousands of charge–discharge cycles increased the capacitance and improved the cycling characteristics, likely due to regeneration and cleaning of the electrode surface.
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spelling pubmed-100961442023-04-13 Partial Oxidation to Extend the Lifetime of Nanoporous Carbon in an Ultracapacitor with Li(2)SO(4) Electrolyte Käärik, Maike Arulepp, Mati Leis, Jaan Molecules Article A TiC-derived carbon (CDC) and its partially oxidized derivative (ox-red-CDC), oxidized by a modified Hummers method, were studied as promising electrode materials for electrochemical energy storage. To evaluate the electrochemical properties of the carbon materials, cyclic voltammetry, galvanostatic cycling, and electrochemical impedance spectroscopy measurements were performed in 1 M Li(2)SO(4) using 2- and 3-electrode cells. A partially oxidized surface was shown to improve the capacitance and electrochemical stability of a nanoporous CDC at positive potential values. The respective anodic capacitance of 80 F cm(−3) reveals a 15% improvement over the non-oxidized CDC. At negative potential values, the capacitance of two carbon materials is almost equal, 97 vs. 93 F cm(−3), for the non-oxidized and partially oxidized CDC materials, respectively. An asymmetric 2-electrode ultracapacitor containing ox-red-CDC as the anode and pristine CDC as the cathode demonstrated an excellent cycle life. The temporary repolarization of the 2-electrode cell after thousands of charge–discharge cycles increased the capacitance and improved the cycling characteristics, likely due to regeneration and cleaning of the electrode surface. MDPI 2023-03-25 /pmc/articles/PMC10096144/ /pubmed/37049709 http://dx.doi.org/10.3390/molecules28072944 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Käärik, Maike
Arulepp, Mati
Leis, Jaan
Partial Oxidation to Extend the Lifetime of Nanoporous Carbon in an Ultracapacitor with Li(2)SO(4) Electrolyte
title Partial Oxidation to Extend the Lifetime of Nanoporous Carbon in an Ultracapacitor with Li(2)SO(4) Electrolyte
title_full Partial Oxidation to Extend the Lifetime of Nanoporous Carbon in an Ultracapacitor with Li(2)SO(4) Electrolyte
title_fullStr Partial Oxidation to Extend the Lifetime of Nanoporous Carbon in an Ultracapacitor with Li(2)SO(4) Electrolyte
title_full_unstemmed Partial Oxidation to Extend the Lifetime of Nanoporous Carbon in an Ultracapacitor with Li(2)SO(4) Electrolyte
title_short Partial Oxidation to Extend the Lifetime of Nanoporous Carbon in an Ultracapacitor with Li(2)SO(4) Electrolyte
title_sort partial oxidation to extend the lifetime of nanoporous carbon in an ultracapacitor with li(2)so(4) electrolyte
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10096144/
https://www.ncbi.nlm.nih.gov/pubmed/37049709
http://dx.doi.org/10.3390/molecules28072944
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