Synthesis and Electrochemical Characterization of Vanadium Oxide/Carbon Nanotube Composites for Supercapacitors

Capacitive properties of vanadium oxides on carbon nanotubes (CNTs) have been investigated. In structural properties, the Raman spectrum shows the characteristic peaks of V 2 O 5, and XPS analysis predicts that the atomic ratio of as-prepared vanadium oxide is approximately the same as that of the stoichiometric V 2 O 5 . Cross-sectional scanning electron microscope images show that CNTs provide good support for uniform distribution of vanadium pentoxides. In capacitive behaviors, CNTs covered with uniformly dispersed oxides lead to a significantly improved capacitive performance, as compared with bare oxide films. Therefore, such V 2 O 5 /CNT nanocomposites are a potential material for power backup of hybrid electrical vehicles or portable electronics.