High performance asymmetric supercapacitor based on CoAl-LDH/GF and activated carbon from expanded graphite

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Authors

Masikhwa, T.M. (Tshifhiwa)
Madito, M.J. (Moshawe)
Momodu, Damilola Y.
Dangbegnon, Julien K.
Guellati, Ouanassa
Harat, Aicha
Guerioune, Mohamed
Barzegar, Farshad
Manyala, Ncholu I.

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Volume Title

Publisher

Royal Society of Chemistry

Abstract

An asymmetric supercapacitor fabricated with CoAl-layered double hydroxide/graphene foam (LDH/GF) composite as the positive electrode and activated carbon derived from expanded graphite (AEG) as negative electrode in aqueous 6 M KOH electrolyte is reported. This CoAl-LDH/GF//AEG cell achieved a specific capacitance of 101.4 F g-1 at a current density of 0.5 A g-1 with a maximum energy density as high as 28 Wh kg-1 and a power density of 1420 W kg-1. Furthermore, the supercapacitor also exhibited an excellent cycling stability with ∼ 100% capacitance retention after 5000 charging-discharging cycles at a current density of 2 Ag-1. The results obtained show the potential use of the CoAl- LDH/GF//AEG material as suitable electrode for enhanced energy storage as supercapacitor.

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Keywords

Activated carbon from expanded graphite, Supercapacitor, Electrochemical capacitor, Graphene foam, Electrical double layer capacitor, CoAl-layered double hydroxide/graphene foam (LDH/GF)

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Citation

Masikhwa, TM, Madito, MJ, Momodu, DY, Dangbegnon, JK, Guellati, O, Harat, A, Guerioune, M, Barzegara, F & Manyala, N 2016, 'High performance asymmetric supercapacitor based on CoAl-LDH/GF and activated carbon from expanded graphite', RSC Advances, vol. 6, no. 52, pp. 46723-46732.