Boosting electrochemical efficiency of WO3@ NiWO4 nanocomposite with carbon-based substrates to employ in high-performance supercapacitor application

Abstract

Innovated WO3@NiWO4/carbon substrates (carbon nanotubes and reduced graphene oxide) nanocomposites were schemed through the multiple step synthesis. In order to fabricate the NiWO4, a hydrothermal method was selected. Also, WO3 nanodisk was synthesized on NiWO4 via an in-situ synthesis approach through the sonochemical route. Finally, during the mild hydrothermal condition, WO3@NiWO4 nanostructure was composited with carbon-based materials and used as supercapacitor electrode. The as-prepared nanocomposites display superb capacity and cyclability compared to pure nanostructures (i.e.WO3 and NiWO4) and binary nanocomposites namely WO3@NiWO4. The physicochemical characterization and compositional analysis of the assynthesized nanostructures were conducted with field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), Powder X-ray diffraction (XRD), Fourier transform infrared spectra (FT-IR) and Brunauer–Emmett–Teller analysis. Additionally, the electrochemical performance of as-designed products was investigated via cyclic voltammetry (CV), galvanostatic charge–discharge cycling (GCD) and electrochemical impedance spectroscopy (EIS). The optimum fabricated electrode (WO3@NiWO4/CNT-16 % (WNCNT-16 %)) provides an excellent specific capacitance of 1897.78 F g