Electrochemical properties of dip-coated vanadium pentaoxide thin films

Abstract

Vanadium oxide (V2O5) thin films have been deposited on to the stainless-steel substrates by simple dip-coating technique using vanadium pentaoxide as an initial ingredient. Deposited samples were annealed at 773 K for 3 h in air. X-ray diffraction analysis of the sample shows crystalline with orthorhombic crystal structure. Scanning electron microscopy study depicts the homogeneous and dense surface morphology. Optical study proves the direct bandgap transition with energy ∼2.25 eV. Electrochemical performance of the deposited electrode was studied in 1 M NaNO 3 electrolyte using cyclic voltammetery, electrochemical impedance spectroscopy and galvanostatic charge–discharge tests. Prepared V2O5 electrode shows 207.50 F g−1 specific capacitance at the scan rate 5 mV s−1, specific energy, specific power and efficiency are 41.33 Wh kg−1, 21 kW kg−1 and 96.72%, respectively. The internal resistance observed from impedance spectroscopy is ∼8.77 ohm. Electrode exhibits excellent chemical stability up to 1000 cycles.