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Graphene and activated carbon-wrapped and Co3O4-intercalated 3D sandwich nanostructure hybrid for high-performance supercapacitance

Abstract

Abstract: Graphene/Co3O4/activated carbon (GCA) hybrid with a distinctive “three dimensional sandwich” structure for supercapacitance with excellent electrochemical property was successfully fabricated via a simple two-step hydrothermal method. The as-synthetized hybrid was characterized by Transmission Electron Microscope (TEM), X-ray diffraction (XRD) and some electrochemical characterization. The results confirmed that Co3O4 particles were homogeneously distributed between the graphene and activated carbon layers. The GCA hybrid capacitor with the mass ratio of activated carbon (AC) and graphene/Co3O4 (GC) is 1:9 shows the best electrochemical property compared with other hybrid capacitor. The specific capacitance of GCA 1:9 hybrid capacitor is 564 F g-1 with AC covering the outside of Co3O4 has improved 53.26% in comparison with the GC composite capacitor (368 F g-1) at the current density of 50 mA g-1 in 7 M KOH electrolyte solution. Besides, the GCA hybrid electrode also exhibits outstanding cycling property with 93.76% capacitance retention over 3000 cycles at the current density of 20 A g-1. Moreover, it also achieve a high energy density of 35.7 Wh kg-1 at the power density of 235.5 W kg-1, demonstrating a promising candidate for supercapacitance.

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Publication details

The article was received on 09 Mar 2018, accepted on 25 Apr 2018 and first published on 03 May 2018


Article type: Paper
DOI: 10.1039/C8NJ01160E
Citation: New J. Chem., 2018, Accepted Manuscript
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    Graphene and activated carbon-wrapped and Co3O4-intercalated 3D sandwich nanostructure hybrid for high-performance supercapacitance

    Y. Li, M. Jia, L. Xu, J. Gao, F. Zhang and X. Jin, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ01160E

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