Oxygen source-Oriented Control of APCVD VO2 for Capacitive Applications

Abstract

Vanadium dioxides of different crystalline orientation planes have successfully been fabricated by chemical vapor deposition at atmospheric pressure using propanol, ethanol and O 2 gas as oxygen sources. The thick a-axis textured monoclinic vanadium dioxide obtained through propanol presented the best electrochemical response in terms of the highest specific discharge capacity of 459 mAh g -1 with a capacitance retention of 97 % after 1000 scans under constant specific current of 2 A g -1. Finally, the electrochemical impedance spectroscopy indicated that the charge transfer of Li + through the vanadium dioxide / electrolyte interface was easier for this sample enhancing significantly its capacitance performance.