Synthesis and electrochemical performance of rGO wrapped mixed metal oxide and sulfide nanocomposite for superior energy storage applications

Abstract

Reduced graphene oxide (rGO) is added to TiO2 and TiS2 to develop several hybrid electrode materials, including rGO/TiO2, rGO/TiS2, and rGO/TiO2/TiS2 to enhance the electrochemical performance. SEM/EDX, TEM, XRD, XPS, and Raman techniques are used to study the resulting hybrid electrode materials. The capacitance and cycling capacity of the synthesized rGO/TiO2, rGO/TiS2, and rGO/TiO2/TiS2 electrode materials are assessed using galvanostatic and cyclic voltammetry testing. The rGO/TiO2/TiS2 exhibits higher electrochemical performance (726 mA h/g) at 20 mV/s, among the investigated composites. The rGO/TiO2/TiS2 electrode was found to have R ct value of 20.4 Ω.cm2. These values indicate that the rGO/TiO2/TiS2 has a much lower resistance, which may be the primary cause of the outstanding electrochemical properties of the rGO/TiO2/TiS2. The retention capacity of 97.93% at 1 A/g upto10,000 cycles shows that this rGO/TiO2/TiS2 hybrid electrode also exhibits good cycling stability. The rGO/TiO2/TiS2 composites’ respective energy and power densities are determined to be 682 Wh/kg and 5073 W/kg. Due to the synergistic interaction between TiS2, rGO, and TiO2, the rGO/TiO2/TiS2 hybrid is demonstrated to be a superior anode material in supercapacitors. Therefore, the newly fabricated rGO/TiO2/TiS2 nanocomposite could be used as the potential material for energy storage applications.