Synthesis and characterization of Nickel Metavanadate (Ni3V2O8)-application as photocatalyst and supercapacitor

Abstract

With the emerging newer energy storage applications, transition metal vanadates are booming up as a better catalyst. Among all the transition metal vanadates, nickel vanadate nanoparticles (Ni₃V₂O₈ NPs), are considered as a promising material with electrocatalytic and photocatalytic activity. We herein report circular and ovular structured Ni₃V₂O₈ NPs by hydrothermal route without using any capping agent. Crystallinity, physical structure and morphology of the prepared samples were studied by XRD, TEM, and FT-IR spectroscopy. Photocatalytic activity of Ni₃V₂O₈ NPs was studied by decolorizing industrially hazardous dyes such as malachite green (MG) and methylene blue (MB) dyes under ultra-violet light conditions for a regular interval of time (15 min) to 90 min. The experiment shows decolorization efficiencies as 52.43 and 57.66% for MG and MB, respectively. The electrochemical behaviour of the prepared compound was studied, and Energy storage capacity (specific capacitance) was elucidated as 193.5 Fg^-1 with high reversibility property the material. These results indicated that Ni₃V₂O₈ is a promising electrode material for supercapacitor and is an excellent photocatalyst. Hence, hydrothermally synthesized Ni₃V₂O₈ NPs are expected to offer significant insight into their multifunctional applications.