The Novel Synergistic Effect of ZnO/TiO2 with Carbonaceous rGO Sheets: As an Emerging High Energy Beneficial Electrode Material for an Asymmetric Supercapacitor Application

In this article, the ternary nanocomposite of ZnO/TiO2/rGO (ZTG) was synthesized via hydrothermal technique. The X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) results substantiated the formation of ternary composites. From field emission-scanning electron microscope (FE-SEM) and high resolution-transmission electron microscope (HR-TEM) analysis, it was noticed that rGO sheets were wrapped tightly on the edges of both ZnO and TiO2 nanoparticles, which offers high active sites during the electrochemical performances. Brunauer-Emmett-Teller (BET) technique revealed, ZTG-2 obtained a larger surface area of 148.73 m(2) g(-1). Based on the electrochemical performances, the active electrode ZTG-2 nanocomposite exhibited a higher specific capacitance of 1278 F g(-1) at a current density of 1 A g(-1). Further, the sample showed an excellent cyclic retention of 90% even after successive 5000 cycles. Additionally, Asymmetric supercapacitor showed a maximum specific capacitance of 360 F g(-1) at 1 A g(-1) and revealed an energy density of 115.2 Wh kg(-1) at a power density of 0.49 W kg(-1) respectively. This article signifies the tactical emergence of ZTG-2 as a promising electrode material for supercapacitor application.