文章基本信息

标题：Large area few-layer graphene with scalable preparation from waste biomass for high-performance supercapacitor
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作者：Taniya Purkait ; Guneet Singh ; Mandeep Singh 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2017
卷号：7
期号：1
页码：15239
DOI：10.1038/s41598-017-15463-w
语种：English
出版社：Springer Nature
摘要：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 m2 g-1) with a sufficiently large pore volume of 1.33 cm3 g-1. For the fabrication of a binder-free supercapacitor, the PS-FLG-based electrodes exhibited a high specific capacity of 186 F g-1 without the use of any binder in 1 M H2SO4 as supporting electrolyte. The highest energy density of 58.125 W h Kg-1 and highest power density of 37.5 W Kg-1 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-1. Solid-state-supercapacitor was fabricated with this material for the possible use of low-cost, high energy promising energy storage device.