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Electro-exfoliating graphene from graphite for direct fabrication of supercapacitor


Abdul Bashid, Hamra Assyaima and Lim, Hong Ngee and Chee, W. K. and Huang, Nay Ming (2016) Electro-exfoliating graphene from graphite for direct fabrication of supercapacitor. Applied Surface Science, 360 (pt. A). pp. 213-223. ISSN 0169-4332; ESSN: 1873-5584

Abstract / Synopsis

A facile production of graphene via electro-exfoliation is demonstrated using different types of oxidizing agent (HNO3, NaNO3, H2SO4 and H2O2) in the presence of sodium dodecylbenzenesulfonate as a surfactant. Different types of surfactant–oxidizing agent solutions in different concentrations significantly influenced the electrochemical exfoliation of graphite rod. The surface morphology, layer thickness and defects of the as-produced graphene are further evaluated. Additionally, the as-produced graphene is fabricated as a supercapacitor electrode via direct vacuum filtration. Nylon membrane and polymer gel, each containing 2.0 M of potassium hydroxide, are utilized to investigate the influence of the electrolyte type on the capacitance performance. Upon 1000 charge/discharge cycles, the nylon membrane electrolyte recorded capacitance retention of 94%, whereas the polymer gel electrolyte recorded an impressive capacitance retention that exceeded 100%. The potential of the fabricated supercapacitor for real applications is manifested by its ability to light up a light-emitting diode upon charging.

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Additional Metadata

Item Type: Article
Subject: Graphene; Surfactant; Oxidizing agent; Electrochemical exfoliation; Supercapacitor
Divisions: Faculty of Science
Institute of Advanced Technology
DOI Number:
Publisher: Elsevier
Depositing User: Nurul Ainie Mokhtar
Date Deposited: 01 Mar 2018 10:52
Last Modified: 01 Mar 2018 10:52
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