Wet chemical synthesis and characterization of FeVO4 nanoparticles for super capacitor as energy storage device

Abstract

Vanadates of transition metal found its potential applications in the fields of lithium ion batteries, gas sensors, photo catalysts, solar cells and so on. Among the metal vanadates, Iron vanadate is vital as an organic pollutant remedying, gas sensor material, and selective catalytic reduction material. This current research focuses on synthesizing iron vanadate nanoparticles by wet chemical synthesis with controlled pH using ammonia solution. The nanostructured FeVO4 particle were characterized structurally with the powder XRD studies. Strong crystal planes were formed at Miller indices (111), (0–12), and (−220) which is confirmed from the intensity of the diffraction peaks. FT- IR and micro Raman studies was taken to identify the molecular vibrations present in the material and it shows that the sharpest apex at 508 cm−1 obtained is attributed to the stretching oscillations of Fe–O and V–O–V modes. The Raman spectrum confirmed the separation of Fe − O, V − O, and different stretching fashions of V − O − Fe. The V–O stretching mode increases the intense bands showing the very high strongest peak of FeVO4 because of electro negativity of iron the metal. The morphology of iron vanadate was confirmed with SEM analysis showing that particles are much isolated and cubical with few polyhedron structures. The electrochemical response of FeVO4 evaluated the specific capacitance at 10 mV/s as 402 Fg−1.Energy density values were calculated as 16.08 Whkg−1, 13.08 Whkg−1, 10.2 Whkg−1, 8.76 Whkg−1, 7.64 Whkg−1 and 6.92 Whkg−1 from the cyclic voltammetry profile at the slow rates varying from 10 −100 mV/s. The magnetic properties were analyzed by measuring the magnetic susceptibility and magnetization using a VSM magnetometer and the results evident that the material exhibits the paramagnetic behavior.