Abstract

Supercapacitor Performance and Characterization of La Doped V₂O₅Nanoparticles

Nagasundar S¹, Anu Kaliani A^1*, Subin S²and Sakunthala Ayyasamy²

DOI : http://dx.doi.org/10.13005/ojc/410112

Abstract:

Supercapacitors as energy storage devices and their unique position within the spectrum of energy storage technologies. Lanthanum doped Vanadium oxide nanoparticles was prepared by using co-precipitation method. The Prepared samples were under gone various characterization such as X-Ray Diffraction, UV-vis spectroscopy, Photoluminescence, FT-IR, and SEM. X-Ray Diffraction (XRD) studies confirms the orthorhombic crystal structure of La doped V₂O₅nanoparticles. UV-vis spectroscopy estimates as slight increase in band gap (E_g) from 3.28 eV (pure V₂O₅) to 3.47 eV (La doped V₂O₅). The Photoluminescence emission inters the increase in oxygen vacancies in La doped V₂O₅. From the results of FTIR spectra, it was observed that the peaks are shifted from lower to higher wavenumbers (right side) and lies between 555to 680nm. The size of the Pure V₂O₅ particles is from 41-54nm where the size of the La doped V₂O₅ Nanoparticle. It is 41-101nm estimated by Sem analysis. The elemental analysis of pure V₂O₅ nanoparticles predicted the chemical compositions of V and C are about 92.83 % and 7.17 % and in 5% La doped V₂O₅ nanoparticles the chemical compositions of V, La and C are about to be about 77.19%, 4.50% and 18.31% respectively. CV studies shows that 5% of La doped V₂O₅nanoparticles have reached the highest discharge capability of 172.96 F/cm² in 5mV with a good cyclic reversibility. The GCD studies estimated that obtained the specific capacitance of 5% La doped V₂O₅ nanoparticles about 119.96 F/g when the discharge current is 0.5 A/g.