Fabrication of Scalable Mesoporous Zincospiroffite (Zn2Te3O8) -RGO Hybrid Electrodes for Low-Cost High-Performance Supercapacitors

A zincospiroffite-reduced graphene oxide (Zn 2 Te 3 O 8 -RGO) hybrid material was synthesized using a straightforward, cost-efficient method for the preparation of an efficient electrode material for supercapacitor application. In ambient conditions, a one-step solvothermal synthesis produces a black glittering composite of Zn 2 Te 3 O 8 -RGO. The structure and morphology of the material was analyzed by using FE-SEM, Fourier Transform Infrared spectroscopy (FTIR), X-ray diffraction (XRD), and Raman scattering. The electrode material was designed to be highly conductive and wettable. A symmetric supercapacitor made of hybrid electrode material exhibits a high specific capacitance of 600 F/g at 1A/g with energy and power densities of 83.33 Wh/kg and 0.99 kW/kg, respectively. A specific capacitance of 513.51 F/g at 10 mV/s with 99% retention has also been measured after 5000 charge-discharge cycles. The hybrid material combines well with an aqueous electrolyte, such as 0.1 M KNO 3 , to form a symmetric supercapacitor with higher power and energy density. For energy storage applications, this material can be an excellent alternative to conventional electrodes.