Journal
NEW JOURNAL OF CHEMISTRY
Volume 41, Issue 22, Pages 13792-13797Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nj03136j
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Funding
- National Research Foundation (NRF) of Korea [NRF-2014R1A2A1A11050882, 2015R1D1A1A01060743, 2015R1A2A2A01004782, 2015R1D1A1A01058851, 2016R1A6A1A03012877]
- National Research Foundation of Korea [2015R1D1A1A01060743, 2014R1A2A1A11050882] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 similar to 1225 m(2) 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.
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