The researchers in this study have developed a new approach for the synthesis of few-layered graphene from no-value biomass waste peanut shell without using any graphitizing agents. The team also synthesized walnut shell and almond shell derived carbon...
Researchers at India's Institute of Nano Science and Technology (INST) have developed a new route for the scalable preparation of large area few-layer graphene from waste biomass (nutshells) for high-performance energy storage devices.
The team's objective of using biomass-waste is not only to solve the problem of waste recycling but also to generate value-added materials like conductive graphene for renewable energy storage devices such as supercapacitors. The Peanut shell-derived graphene is said to posses remarkably high specific surface area (2070 m2 g−1) and excellent specific capacitance. This method is reportedly scalable, renewable and cost-effective.
The resulting electrodes based on the nutshell-drived graphene 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.
The researchers in this study have developed a new approach for the synthesis of few-layered graphene from no-value biomass waste peanut shell without using any graphitizing agents. The PS-FLG material is suitable for application in supercapacitors. The team also synthesized walnut shell and almond shell derived carbon for comparison purpose, and the PS-FLG possesses approximately four times more specific capacitance than WS-C and two times more than AS-C.