Pseudocapacitive properties of electrochemically prepared vanadium oxide on carbon nanotube film substrate

Vanadium oxide (V2 O5 x H2 O) was electrodeposited on a carbon nanotube (CNT) film substrate with a three-dimensional porous structure at the nanometer scale as an electrode material for pseudocapacitors using organic electrolytes. Microstructures of the electrochemically prepared V2 O5 x H2 O on the CNT film substrate (V2 O5 x H2 O /CNT film electrode) showed that V2 O5 x H2 O was heterogeneously nucleated and uniformly deposited on the CNT film substrate. The V2 O5 x H2 O /CNT film electrode showed not only a high specific Li-ion capacitance of 1230 Fg with respect to the mass of the V2 O5 x H2 O, but also a high rate capability. The maximum specific energy of 851 Whkg and specific power of 125 kWkg were obtained from the discharging curves of the V2 O5 x H2 O /CNT film electrode. They could be attributed to the electrode construction comprising a very thin film of V2 O5 x H2 O deposited on the conductive CNT film substrate with a three-dimensional nanoporous structure.