Facile and rapid method to synthesis sulfur and nitrogen co-doped graphene quantum dots as an electrode material with excellent specific capacitance for supercapacitors application

Muhiuddin, M and Devi, NA and Bharadishettar, N and Meti, S and Siddique, AB and Satyanarayan, MN and Udaya, BK and Akhtar, W and Rahman, MR (2024) Facile and rapid method to synthesis sulfur and nitrogen co-doped graphene quantum dots as an electrode material with excellent specific capacitance for supercapacitors application. In: Diamond and Related Materials, 146 .

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Abstract

The current invention pertains to the expeditious simple synthesis of electrode materials that improve the storage capacity of supercapacitors (SCs). Sulfur and nitrogen co-doped graphene quantum dots (SN-GQDs) are synthesized using a microwave-assisted hydrothermal (MAH) process at low pressure and with a short reaction time. The utilization of SN-GQDs in conjunction with Polyaniline (PANI) has the potential to enhance the supercapacitor's energy and power density, owing to their notable specific capacitance. Implementing SN-GQDs material as an SCs electrode, exhibiting an outstanding specific capacitance of 1040 F/g at an applied current density of 0.5 A g�1. Furthermore, a composite of SN-GQDs/PANI is synthesized and the electrochemical performance is compared with the as-synthesized PANI. The symmetrical SCs are fabricated using SN-GQDs/PANI composite, and PANI. At a current density of 0.5 A g�1 SN-GQDs/PANI composite-based SC displays a superior energy density of 44.25 Wh/kg at a power density of 1.227 kW/kg. This is high in comparison to PANI-based SC which shows an energy density of 18.71 Wh/kg at 0.8 kW/kg power density at the same current density. The SC created using SN-GQDs/PANI composite exhibits superior properties and is a promising material for SC applications. © 2024 Elsevier B.V.

Item Type:	Journal Article
Publication:	Diamond and Related Materials
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd.
Keywords:	Capacitance; Current density; Electrodes; Graphene; Hydrothermal synthesis; Nanocrystals; Nitrogen; Semiconductor quantum dots; Sulfur, Co-doped; Energy density; Graphene quantum dot; Microwave-assisted hydrothermal; Power densities; Specific capacitance; Symmetric supercapacitor; Symmetrics; Synthesised, Supercapacitor
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	06 Aug 2024 12:01
Last Modified:	06 Aug 2024 12:01
URI:	http://eprints.iisc.ac.in/id/eprint/85246

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