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Scalable, large-area synthesis of heteroatom-doped few-layer graphene-like microporous carbon nanosheets from biomass for high-capacitance supercapacitors

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Abstract

High-capacitance electrochemical supercapacitors are promising devices due to their long-term stability and simple device construction. Unlike available reports on biomass-derived carbon as supercapacitor electrodes, in this paper, we report novel few-layer graphene-like microporous carbon nanosheets obtained from a single biomass precursor, which yield very high specific capacitance. A simple, ultra-low cost, one-step activation-free approach yields few-layer graphene-like microporous carbon nanosheets in the presence of heteroatoms by using ginger root as a biomass precursor. Suitable heteroatom content combined with porous graphene-like carbon nanosheet structure enhances the specific capacitance. The as-prepared carbon nanosheets from ginger roots possessing few-layer graphene-like structures are confirmed by X-ray diffraction and transmission electron microscopy, and the presence of few heteroatoms is confirmed by energy dispersive spectroscopy. The electrochemical measurements reveal that the ginger root-derived carbon electrode exhibits very high specific capacitance of 390 F gāˆ’1 at 1 A gāˆ’1 of current density. The ginger-derived carbon electrode also has 93.3% capacitance retention until 3500 charge/discharge cycles. This approach indicates great potential to achieve sustainable, low-cost, simple and large-scale production of renewable biomass-derived carbon materials for efficient energy storage applications in the future.

Graphical abstract: Scalable, large-area synthesis of heteroatom-doped few-layer graphene-like microporous carbon nanosheets from biomass for high-capacitance supercapacitors

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Publication details

The article was received on 09 Oct 2018, accepted on 29 Nov 2018 and first published on 29 Nov 2018


Article type: Paper
DOI: 10.1039/C8NJ05128C
Citation: New J. Chem., 2019, Advance Article
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    Scalable, large-area synthesis of heteroatom-doped few-layer graphene-like microporous carbon nanosheets from biomass for high-capacitance supercapacitors

    A. Gopalakrishnan, C. Y. Kong and S. Badhulika, New J. Chem., 2019, Advance Article , DOI: 10.1039/C8NJ05128C

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