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Issue 17, 2019
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In situ encapsulation of Co3O4 polyhedra in graphene sheets for high-capacitance supercapacitors

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Abstract

Co3O4 polyhedra were well encapsulated in reduced graphene oxide (rGO) sheets by in situ growth of Co-based zeolitic imidazolate framework (ZIF-67) polyhedra in the presence of graphene oxide followed by thermal annealing. The resultant rGO/Co3O4 composites consist of a continuously-conductive double-network constructed from graphene sheets and the derived N-doped carbons from ZIF-67, showing a large specific surface area of 523 m2 g−1. The as-fabricated symmetrical supercapacitor based on rGO/Co3O4 exhibits a high specific capacitance of 277.5 F g−1 at 25 A g−1 and an energy density of 24.7 W h kg−1 at a power density of up to 40 kW kg−1. The supercapacitor also retains 87.5% of the initial capacitance over 5000 cycles at 5 A g−1. Such large capacitance, high energy density, and excellent cycling stability for rGO/Co3O4 are attributable to the 3D double conductive network from 2D graphene sheets and porous channels of pseudo-capacitive Co3O4 polyhedra.

Graphical abstract: In situ encapsulation of Co3O4 polyhedra in graphene sheets for high-capacitance supercapacitors

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Publication details

The article was received on 02 Feb 2019, accepted on 29 Mar 2019 and first published on 29 Mar 2019


Article type: Paper
DOI: 10.1039/C9DT00521H
Citation: Dalton Trans., 2019,48, 5773-5778

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    In situ encapsulation of Co3O4 polyhedra in graphene sheets for high-capacitance supercapacitors

    G. Lin, Y. Jiang, C. He, Z. Huang, X. Zhang and Y. Yang, Dalton Trans., 2019, 48, 5773
    DOI: 10.1039/C9DT00521H

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