A simple, economical one-pot microwave assisted synthesis of nitrogen and sulfur co-doped graphene for high energy supercapacitors. (1st May 2020)

• Record Type: Journal Article
• Authors: Domga, ; Karnan, Manickavasakam; Oladoyinbo, Fatai; Noumi, Guy Bertrand; Tchatchueng, Jean Bosco; Sieliechi, Marie Joseph; Sathish, Marappan; Pattanayak, Deepak K.
• Is Part Of: Electrochimica acta. Volume 341(2020)
• Publication Date: 2020-05-01
• Subjects: Nitrogen and sulfur co-doped graphene -- Microwave irradiation -- Supercapacitor -- Energy density -- Ionic liquid -- Redox-additive; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2020.135999
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Supercapacitors are continuously gaining popularity in the market because of their powerful ultrafast charging ability, yet their energy is still low while contrasting with batteries. In most cases, utilization of redox additive materials (either by decoration or composite creation) and the redox response in the electrolyte itself are some of the strategies for improving the poor energy density of supercapacitors. Herein, we present, a facile, fast and economical one-pot microwave-assisted synthesis, characterization and supercapacitor application of nitrogen and sulfur co-doped graphene (NSG). The characterization result shows good exfoliation and a superior amount of heteroatoms content (14.9% of Nitrogen and 4.3% of Sulfur) in the graphene. The 1:1.5NSG shows a maximum specific capacitance of 310 F/g in two electrodes symmetric configuration using 1 M H2 SO4 electrolyte. In addition, the device fabrication shows a high specific capacitance of 226 F/g and 150 F/g in non-aqueous organic and ionic liquid electrolytes with an energy density of 31 Wh/kg and 32 Wh/kg, respectively. In redox additive 0.015 M HQ in H2 SO4 electrolyte, the supercapacitor device exhibits enhanced specific capacitance (667 F/g) with maximum energy density of 59 Wh/kg, which is very high and comparable to lithium-ion batteries. Graphical abstract: Image 1