HYDROTHERMALLY PREPARED VANADIUM OXIDE-CHITOSAN NANOCOMPOSITE FOR ELECTROCATALYTIC APPLICATION

Abstract

In this project work, the nanostructured vanadium penta oxide (V2O5) has been prepared using the hydrothermal method. These nanostructured vanadium penta oxide (V2O5) used for fabrication of efficient non-enzymatic sensor for electro-oxidation of hydrazine. A colloidal solution of prepared nanostructures has been electrophoretically deposited (EPD) onto an indium-tin-oxide (ITO) glass substrate and and utilized for electro-oxidation of hydrazine. The crystalline structure and morphology of prepared sample have been determined by X-ray diffraction (XRD) (particle size ~25nm), scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM) and Fourier transform infrared (FTIR) spectroscopic techniques. The optical properties of prepared sample have been examined by ultra-violet (UV–Vis), photoluminescence (PL). Chitosan(CHIT) (a biopolymer) was used as a matrix to prepare the nanocomposite. The V2O5 nanoparticles were then ultrasonically dispersed in chitosan (CHIT) solution, and then used to form V2O5- CHIT/ITO nanocomposite electrode by drop casting method on the ITO plate. The V2O5- CHIT/ITO nanocomposite electrode was found to provide improved sensing characteristics to the electrode interface in terms of electroactive surface area, diffusion coefficient, charge transfer rate constant and electron transfer kinetics. This interfacial platform has been used for fabrication of a non-enzymatic sensor for electro-oxidation of hydrazine. The results of response studies of the fabricated V2O5-CHIT/ITO electrode catalytic oxidation peak current shows a linear dependence on the hydrazine concentration and a linear calibration curve is obtained in the concentration range of 2-22 mM, lower detection limit of 1.6239 mM, standard deviation of 0.00249μA and high sensitivity of 0.00460 μA/(mM cm2) with a response time of 20 s. The utilization of this V2O5 modified electrode for electo-oxidation of hydrazine offers an efficient strategy and a novel interface for application of vanadium penta oxide (V2O5) in the field of electrochemical sensors. The obtained results indicate that the nanostructured V2O5 based electrode offers an efficient strategy and a new promising platform for application of the metal oxide material in electrochemistry and bioelectronics.