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Controlled electrochemical surface exfoliation of graphite pencil electrodes for high-performance supercapacitors

A controlled surface exfoliation method for graphite pencil electrodes using an environmentally friendly, low cost and scalable electrochemical process is reported. A simple direct current power supply in a neutral medium is used for inducing graphene formation on the electrode surface in a controll...

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Autores principales: AbdelHamid, Ayman A., Elgamouz, Abdelaziz, Kawde, Abdel-Nasser
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10346469/
https://www.ncbi.nlm.nih.gov/pubmed/37456541
http://dx.doi.org/10.1039/d3ra03952h
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author AbdelHamid, Ayman A.
Elgamouz, Abdelaziz
Kawde, Abdel-Nasser
author_facet AbdelHamid, Ayman A.
Elgamouz, Abdelaziz
Kawde, Abdel-Nasser
author_sort AbdelHamid, Ayman A.
collection PubMed
description A controlled surface exfoliation method for graphite pencil electrodes using an environmentally friendly, low cost and scalable electrochemical process is reported. A simple direct current power supply in a neutral medium is used for inducing graphene formation on the electrode surface in a controlled manner. The electrochemical properties of the surface exfoliated electrode are characterized, displaying a >300× increase in the electrochemical surface area and >50× decrease in the electrode resistance after exfoliation. The surface graphene layer is characterized using electron microscopy, Raman, infrared, X-ray photoelectron, and energy dispersive X-ray spectroscopies and X-ray diffractometry showing a fully exfoliated surface, formation of surface defects and mild surface graphene oxidation while maintaining an intact graphitic crystal structure. The surface exfoliated electrode is tested as a supercapacitor demonstrating more than 2 orders of magnitude improvement over non-exfoliated electrode in both 3-electrode and 2-electrode setups and achieving a high areal capacitance of ∼54 mF cm(−2). The benign nature, low cost, scalability of our controlled surface exfoliation methodology, and its significant impact on the electrochemical properties of the electrode make it very promising for further investigation in various applications such as energy storage and conversion, sensors, and catalysis.
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spelling pubmed-103464692023-07-15 Controlled electrochemical surface exfoliation of graphite pencil electrodes for high-performance supercapacitors AbdelHamid, Ayman A. Elgamouz, Abdelaziz Kawde, Abdel-Nasser RSC Adv Chemistry A controlled surface exfoliation method for graphite pencil electrodes using an environmentally friendly, low cost and scalable electrochemical process is reported. A simple direct current power supply in a neutral medium is used for inducing graphene formation on the electrode surface in a controlled manner. The electrochemical properties of the surface exfoliated electrode are characterized, displaying a >300× increase in the electrochemical surface area and >50× decrease in the electrode resistance after exfoliation. The surface graphene layer is characterized using electron microscopy, Raman, infrared, X-ray photoelectron, and energy dispersive X-ray spectroscopies and X-ray diffractometry showing a fully exfoliated surface, formation of surface defects and mild surface graphene oxidation while maintaining an intact graphitic crystal structure. The surface exfoliated electrode is tested as a supercapacitor demonstrating more than 2 orders of magnitude improvement over non-exfoliated electrode in both 3-electrode and 2-electrode setups and achieving a high areal capacitance of ∼54 mF cm(−2). The benign nature, low cost, scalability of our controlled surface exfoliation methodology, and its significant impact on the electrochemical properties of the electrode make it very promising for further investigation in various applications such as energy storage and conversion, sensors, and catalysis. The Royal Society of Chemistry 2023-07-14 /pmc/articles/PMC10346469/ /pubmed/37456541 http://dx.doi.org/10.1039/d3ra03952h Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
AbdelHamid, Ayman A.
Elgamouz, Abdelaziz
Kawde, Abdel-Nasser
Controlled electrochemical surface exfoliation of graphite pencil electrodes for high-performance supercapacitors
title Controlled electrochemical surface exfoliation of graphite pencil electrodes for high-performance supercapacitors
title_full Controlled electrochemical surface exfoliation of graphite pencil electrodes for high-performance supercapacitors
title_fullStr Controlled electrochemical surface exfoliation of graphite pencil electrodes for high-performance supercapacitors
title_full_unstemmed Controlled electrochemical surface exfoliation of graphite pencil electrodes for high-performance supercapacitors
title_short Controlled electrochemical surface exfoliation of graphite pencil electrodes for high-performance supercapacitors
title_sort controlled electrochemical surface exfoliation of graphite pencil electrodes for high-performance supercapacitors
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10346469/
https://www.ncbi.nlm.nih.gov/pubmed/37456541
http://dx.doi.org/10.1039/d3ra03952h
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