One pot solvothermal synthesis of novel solid state N-Doped TiO2/n-Gr for efficient energy storage devices. (June 2019)

• Record Type: Journal Article
• Authors: Maity, Chandan Kumar; Hatui, Goutam; Tiwari, Santosh Kumar; Udayabhanu, G.; Pathak, D.D.; Chandra Nayak, Ganesh; Verma, Kartikey
• Is Part Of: Vacuum. Volume 164(2019)
• Page Start: 88
• Page End: 97
• Publication Date: 2019-06
• Subjects: Supercapacitors -- Solvothermal -- XPS -- Cyclic stability -- Power density -- TEABF4; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2019.02.002
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: Single pot solvothermal synthetic procedure was followed for easy synthesis of n-TiO2 /n-Gr composite for supercapacitor. FTIR, XRD, XPS and FESEM were executed to access the chemical nature, interaction, growth and morphology of the samples. In both three and two electrode arrangement, n-TiO2 /n-Gr leads to 937.5 F/g and 633.75 F/g specific capacitance (SC) respectively. Enhanced SC may be due to facile electron carry-over in n-TiO2 deposited n-Gr surface. This superior SC complemented with high energy density (ED) of 46.25 Wh/kg and power density (PD) 3999.51 W/kg. This composite also retains about 87% retention of SC after 5000 successive charge–discharge rounds. However, in organic electrolyte (1 M TEABF4 in acetonitrile) with two-electrode testing configuration, the composite showed an energy density of 225.33 Wh/kg with high power density of 1599.7 W/kg. N doped in both TiO2 and graphene enhanced the compatibility and electrochemical performances of electrode material and makes it a potential candidate for supercapacitor. Graphical abstract: Image 1 Highlights: The paper first time reported template free, facile synthesis of n- TiO2 /n-Gr composite. The n- TiO2 /n-Gr showed specific capacitance 937.5 Fg -1 at 0.6 A g −1 . Electrochemical study is performed in both three and two electrode system. The two-electrode system shows a high energy density 225.33 W h Kg −1 at 1 A g −1 . 87% retention of specific capacitance also exhibited even after 5000 cycles of GCD.