Electrochemical properties of dip-coated vanadium pentaoxide thin films

[摘要] Vanadium oxide (V$_2$O$_5$) 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 at773 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 provesthe direct bandgap transition with energy $\sim$2.25 eV. Electrochemical performance of the deposited electrode was studied in 1 M NaNO$_3$ electrolyte using cyclic voltammetery, electrochemical impedance spectroscopy and galvanostatic charge–discharge tests. Prepared V$_2$O$_5$ 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 Whkg$^{−1}$, 21 kW kg$^{−1}$ and 96.72%, respectively. The internal resistance observed from impedance spectroscopy is $\sim$8.77 ohm. Electrode exhibits excellent chemicalstability up to 1000 cycles.

[学科分类] 材料工程

[关键词] Chemical synthesis;annealing;thin films;electrochemical properties;energy storage.