High performance asymmetric supercapacitor based on CoAl-LDH/GF and activated carbon from expanded graphite
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Date
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.
Journal Title
Journal ISSN
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.
Description
Keywords
Activated carbon from expanded graphite, Supercapacitor, Electrochemical capacitor, Graphene foam, Electrical double layer capacitor, CoAl-layered double hydroxide/graphene foam (LDH/GF)
Sustainable Development Goals
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.