Electrodeposition of Nickel and Cobalt Mixed Oxide/Carbon Nanotube Thin Films and Their Charge Storage Properties

Abstract

Nickel and cobalt mixed oxides [denoted as ] were electrochemically deposited onto carbon nanotube (CNT) film substrate with a three-dimensional nanoporous structure in aqueous solutions containing different ratios of cobalt(II) and nickel(II). For comparison, the were also prepared on nickel mesh substrate. Microstructures and performances of these -based electrodes examined by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy showed that layers were anodically deposited on the surface of the CNTs. The electrochemical properties of these composite electrodes were investigated by cyclic voltammetry and charge/discharge. The results indicated that the deposition of on the CNT film improved the electrochemical performance due to the electrode construction comprising thin electroactive film on the conductive CNT film with a three-dimensional nanoporous structure. Furthermore, the effect of the ratios of on the electrochemical properties of film electrode were also discussed in detail.