Few layer graphene nanosheets from kinnow peel waste for high-performance supercapacitors: A comparative study with three different electrolytes. (25th November 2022)

• Record Type: Journal Article
• Authors: Pathak, Mayank; Tatrari, Gaurav; Karakoti, Manoj; Pandey, Sandeep; Sahu, Prateekshya Suman; Saha, Biswajit; Sahoo, Nanda Gopal
• Is Part Of: Journal of energy storage. Volume 55:Part C(2022)
• Publication Date: 2022-11-25
• Subjects: Kinnow peel waste (KPW) -- Supercapacitor -- Graphene nanosheets -- Specific capacitance; Energy storage -- Periodicals; Energy storage -- Research -- Periodicals; 621.3126
• DOI: 10.1016/j.est.2022.105729
• Languages: English
• ISSNs: 2352-152X

Abstract

Abstract: Utilization of carbonaceous waste into energy storage applications not only solves the problem of waste management but also promotes the circular economy. Any carbonaceous material with a high surface area and sheet-like nanostructure facilitates fast-ion transport due to which it can act as a suitable candidate for the electrode material in Supercapacitors. This work reports the preparation of few-layer graphene nanosheets from fruit waste: kinnow peel waste (KPW) for the first time, via two-step pyrolysis with activation using KCl as the activating agent followed by probe sonication. The confirmation of few-layer graphene (FLG) nanosheets from KPW was done with the help of RAMAN, XRD, FT-IR, SEM, and TEM. The high surface area with the presence of both the meso and micropores in synthesized FLG nanosheets was confirmed with the help of BET. The KPW-derived few-layer graphene (KPW-FLG) nanosheets were further investigated for high-performance supercapacitors by fabricating three different supercapacitor devices (SCs); SC-1, SC-2, and SC-3 corresponded to 6 M KOH, 1 M H2 SO4 and 1 M H3 PO4 respectively. The ideal and reversible capacitive behavior of the fabricated SC devices was analyzed with the help of Cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) techniques. The SC-2 displayed the highest gravimetric specific capacitance (Cs ) value of 642 F/g at a scan rate of 5 mV/s in a 1 M H2 SO4 electrolyte with the highest energy density of 48.9 Wh/Kg and better power density of 629.5 W/Kg. Our study revealed that the KPW-FLG can be used as the potential candidate for electrode material in fabricating the high-performance supercapacitor which showed the best results in capacitance, charge-discharge, cyclic stability, and energy density with 1 M H2 SO4 electrolyte. Graphical abstract: Unlabelled Image Highlights: Synthesis of few layer graphene nanosheets from Kinnow Peel Waste, for the first time. The Supercapacitor device fabrication using KPW- FLG as electrode material. Optimisation of the SC device with electrolytes 6M KOH, 1M H2 SO4, and 1M H3 PO4 . Best results shown with 1M H2 SO4 electrolyte for the high performance SC device.