Large area few-layer graphene with scalable preparation from waste biomass for high-performance supercapacitor

作者：Purkait Taniya; Singh Guneet; Singh Mandeep; Kumar Dinesh; Dey Ramendra Sundar

来源：Scientific Reports, 2017, 7(1): 15239.

DOI：10.1038/s41598-017-15463-w

<jats:title>Abstract</jats:title><jats:p>Carbonaceous materials with high surface area and a sheet-like structure promote fast ion-transport kinetics, making them an ideal choice to be used in supercapacitors. Few-layer graphene (FLG)-like nanosheets with abundance of micro as well as mesopores are achieved via mechanical exfoliation method from an agricultural waste biomass: peanut shell (PS). A well-known elementary method of probe-sonication, for the achievement of FLG sheets from renewable sources, is introduced in this study for the very first time. The Peanut shell-derived FLG (PS-FLG) possesses remarkably high specific surface area (2070 m<jats:sup>2</jats:sup> g<jats:sup>−1</jats:sup>) with a sufficiently large pore volume of 1.33 cm<jats:sup>3</jats:sup> g<jats:sup>−1</jats:sup>. For the fabrication of a binder-free supercapacitor, the PS-FLG-based electrodes exhibited a high specific capacity of 186 F g<jats:sup>−1</jats:sup> without the use of any binder in 1 M H<jats:sub>2</jats:sub>SO<jats:sub>4</jats:sub> as supporting electrolyte. The highest energy density of 58.125 W h Kg<jats:sup>−1</jats:sup> and highest power density of 37.5 W Kg<jats:sup>−1</jats:sup> was achieved by the material. Surprisingly, the working potential increased to 2.5 V in an organic electrolyte leading to an obvious increase in the energy density to 68 W h Kg<jats:sup>−1</jats:sup>. Solid-state-supercapacitor was fabricated with this material for the possible use of low-cost, high energy promising energy storage device.</jats:p>

• 出版日期2017-11-10