Impact of hydrothermal and solvent-thermal synthesis on the electrochemical performance of V2O5

Abstract

This research focuses on synthesizing vanadium oxide through hydrothermal and solvent-thermal methods, to explore their potential application in supercapacitors. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) are used to determine the crystalline size and functional group, while scanning electron microscopy (SEM) is used to investigate their morphologies. The electrochemical performance was evaluated through cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopy (EIS). The results demonstrated that the V2O5 synthesized by the hydrothermal method exhibited two-fold increases in specific capacitance compared to those produced by the solvent-thermal method. Experimental results also indicate that nanoparticles V2O5 by hydrothermal can deliver a capacitance of 121 Fg−1 and solvent-thermal deliver a capacitance of 72 Fg−1 at the current density of 1 Ag−1 in the potential range from 0 to 0.45 V in a 3 M KOH aqueous electrolyte.