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Ultrathin graphene nanosheets derived from rice husks for sustainable supercapacitor electrodes

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Abstract

Graphene nanosheets are synthesized via the carbonization of brown-rice husks followed by a one-stage KOH-activation process for the design of a sustainable electrochemical energy-storage electrode. The graphene nanosheets exhibit an ultra-thin crumpled-silk-veil-wave, sheet-like structure with a high surface area of ∼1225 m2 g−1 and a high porosity. The graphene-nanosheet electrode shows a specific capacitance of 115 F g−1 at 0.5 mA cm−2 and a high energy density of 36.8 W h kg−1 at a power density of 323 W kg−1, with an excellent cyclic stability of 88% over 2000 cycles. The observed good electrochemical energy-storage performance of the biomaterial-derived graphene-nanosheet electrode is due to the synergistic effect of the intrinsically large electrochemically active surface area, an enhanced ion diffusion, and an improved electrical conductivity.

Graphical abstract: Ultrathin graphene nanosheets derived from rice husks for sustainable supercapacitor electrodes

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Publication details

The article was received on 22 Aug 2017, accepted on 11 Oct 2017 and first published on 11 Oct 2017


Article type: Paper
DOI: 10.1039/C7NJ03136J
Citation: New J. Chem., 2017, Advance Article
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    Ultrathin graphene nanosheets derived from rice husks for sustainable supercapacitor electrodes

    S. Sankar, H. Lee, H. Jung, A. Kim, A. T. A. Ahmed, A. I. Inamdar, H. Kim, S. Lee, H. Im and D. Young Kim, New J. Chem., 2017, Advance Article , DOI: 10.1039/C7NJ03136J

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