Single pot fabrication of N doped reduced GO (N-rGO) /ZnO-CuO nanocomposite as an efficient electrode material for supercapacitor application. (November 2018)

• Record Type: Journal Article
• Authors: Maity, Chandan Kumar; Hatui, Goutam; Verma, Kartikey; Udayabhanu, G.; Pathak, D.D.; Nayak, Ganesh Chandra
• Is Part Of: Vacuum. Volume 157(2018)
• Page Start: 145
• Page End: 154
• Publication Date: 2018-11
• Subjects: Nitrogen doping -- XRD -- FESEM -- Cyclic stability -- Energy density and power density; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2018.08.019
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: Flower like ZnO and plate like CuO were fabricated upon rGO and Nitrogen doped rGO following a simple scalable cheapest facile hydrothermal treatment. XRD, FTIR and XPS analysis confirm the Formation of N-doping on rGO as well as all composites. FESEM analysis reveals the distribution of metal oxide upon the graphene nanosheets. Electrochemical activity in case of ZnO-CuO/N-rGO nanocomposite in 1 M aq. KOH exhibits 1075 Fg −1 specific capacitance (SC) at 1 Ag -1 current density. We also derived a superior energy density (ED) value of the fabricated nanocomposite to be 95.55Whkg −1 with power density (PD) 399.97 Wkg -1 . Additionally, the electrode made up of hybrid ZnO-CuO/N-rGO nanocomposites displays excellent cyclic stability of 88% retention of specific capacitance after completion of 5000 cycles. These outcomes specify a hopeful prospective approach of the ZnO-CuO/N-rGO nanocomposite as a successful electrode substance in supercapacitors. Highlights: The paper first time reported facile synthesis of ZnO-CuO/N-rGO nanocomposite. The ZnO-CuO/N-rGO showed specific capacitance 1075 F/g at 1 A g −1 . Electrochemical study is performed in both three and two electrode system. The two-electrode system shows a high energy density 238.93 W h kg -1 and power density 1601 Wkg - 1 at 1 A g −1 . 88% retention of specific capacitance also exhibited even after 5000 cycles of GCD.