Ultrathin graphene nanosheets derived from rice husks for sustainable supercapacitor electrodes. (23rd October 2017)

• Record Type: Journal Article
• Authors: Sankar, S.; Lee, Hwauk; Jung, Hyun; Kim, Aran; Ahmed, Abu Talha Aqueel; Inamdar, Akbar I.; Kim, Hyungsang; Lee, Sejoon; Im, Hyunsik; Young Kim, Deuk
• Is Part Of: New journal of chemistry. Volume 41:Number 22(2017)
• Page Start: 13792
• Page End: 13797
• Publication Date: 2017-10-23
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c7nj03136j
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Ultrathin graphene nanosheets were derived from rice husks via KOH activation and they showed excellent electrochemical performances. 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 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.