Supercritical fluid deposition of vanadium oxide on multi-walled carbon nanotube buckypaper for supercapacitor electrode application

Composite electrodes were fabricated for supercapacitor applications by depositing vanadium oxide onto multi-walled carbon nanotube (MWCNT) buckypaper using supercritical fluid deposition (SFD). The deposited thin vanadium oxide layer showed amorphous structure with excellent uniformity. In aqueous KCl electrolyte, the vanadium oxide exhibited a constant pseudo-capacitance of ∼ 1024Fg^{- 1}, which was independent of the oxide material loading (up to 6.92wt%) and voltage scan rate (up to 100mVs^{- 1}). The highest specific electrode capacitance achieved was ∼ 85Fg^{- 1}, which was almost four times that of the pristine buckypaper electrode.