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Issue 3, 2018
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Three-dimensional porous graphene-like sheets synthesized from biocarbon via low-temperature graphitization for a supercapacitor

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Abstract

Biocarbons are difficult to graphitize even at 3000 °C. In this study, three-dimensional porous graphene-like sheets (3DPGLS) were directly synthesized from biocarbons at 900 °C. Potassium carbonate was utilized as a catalyst to release graphite microcrystals from the crosslinked sp3 carbon atoms in the hard carbon phase, and subsequently recrystallized them to form graphene layers. The as-obtained 3DPGLS showed a high purity and low defect density, and possessed high conductivity (32.14 S cm−1) and specific surface area (1506.19 m2 g−1). Without conductive additives, the capacitance of 3DPGLS reached 91.15 F g−1 at a current density of 0.2 A g−1 acting as a two-electrode symmetrical supercapacitor electrode material in an organic electrolyte. 85.1% of the initial capacitance was maintained after 5000 cycles at a current density of 0.1 A g−1.

Graphical abstract: Three-dimensional porous graphene-like sheets synthesized from biocarbon via low-temperature graphitization for a supercapacitor

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Publication details

The article was received on 13 Nov 2017, accepted on 20 Dec 2017 and first published on 20 Dec 2017


Article type: Paper
DOI: 10.1039/C7GC03426A
Citation: Green Chem., 2018,20, 694-700
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    Three-dimensional porous graphene-like sheets synthesized from biocarbon via low-temperature graphitization for a supercapacitor

    J. Xia, N. Zhang, S. Chong, D. Li, Y. Chen and C. Sun, Green Chem., 2018, 20, 694
    DOI: 10.1039/C7GC03426A

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