Synthesis and Characterization of Vanadium Oxide Nanotubes as Electrode Materials for Electrochemical Capacitors

摘要

Vanadium oxide nanotubes were synthesized by hydrothermal treatment with high-speed stirring. The preparation involved dissolution of V_2O_5 into H_2O_2 and high-speed stirring (10000 r/min) with hexadecylamine. The product was characterized by scanning electron microscopy, transmission electron microscope, X-ray diffraction and thermogravimetric analysis. The electrochemical properties of the materials as electrodes for electrochemical capacitors were evaluated by cyclic voltammetry in a three electrode system consisting of a saturated calomel electrode as reference electrode, platinum as a counter electrode and the active materials as the working electrode. A high capacitance of 148.5 F/g was obtained at a scan rate of 2 mV/s in 2M KCl. The electrode maintained a high capacitance of 105 F/g at a higher scan rate of 50 mV/s in 2M KCl electrolyte.