Dependence of capacitive properties of an EDLC on exfoliation time of graphite electrodes

The scientific focus has been directed through the production and application of “wonder material-graphene” after its discovery in 2004. But the mass production cost has become a huge disadvantage towards commercializing graphene-based manufactures. As alternative low-cost material, exfoliated graph...

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Bibliographic Details
Published inJournal of materials science. Materials in electronics Vol. 32; no. 13; pp. 17580 - 17587
Main Authors Rajaguru, Dinithi S. K., Vidanapathirana, Kamal P., Perera, Kumudu S.
Format Journal Article
LanguageEnglish
Published New York Springer US 01.07.2021
Springer Nature B.V
Subjects
Capacitance
Characterization and Evaluation of Materials
Chemistry and Materials Science
Discharge
Electrochemical impedance spectroscopy
Electrode materials
Electrodes
Energy storage
Exfoliation
Graphene
Graphite
Liquid phases
Mass production
Materials Science
Nanostructured materials
Optical and Electronic Materials
Production costs
Relaxation time
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Summary:The scientific focus has been directed through the production and application of “wonder material-graphene” after its discovery in 2004. But the mass production cost has become a huge disadvantage towards commercializing graphene-based manufactures. As alternative low-cost material, exfoliated graphite (EG) has emerged to be a novel nanostructured carbon material with a potential for electrochemical energy storage device applications owed to its unique characteristics similar to graphene. In this study a series of EG samples were prepared by a surfactant-mediated liquid-phase exfoliation method by changing the exfoliation time. Electrochemical double-layer capacitors (EDLCs) were fabricated using different EG samples as an electrode material and a gel polymer electrolyte (GPE). They were characterized by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and galvanostatic charge discharge (GCD) techniques. EDLC having EG electrodes of 10 h exfoliation time showed the highest results with single-electrode specific capacitance ( C sc ) of 4.12 F g −1 , single-electrode specific discharge capacitance ( C sd ) of 1.10 F g −1 , and relaxation time of 0.22 s from CV, GCD, and EIS, respectively.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-021-06291-w