Preparation and Electrochemical properties of composite electrodes of nickel oxide/WMNTS

摘要

Nanostructured composite materials with α-Ni(OH){sub}2 loaded on multiwalled carbon nanotubes (MWNTS) of different mass (5wt%, 10wt%, 20wt%) were synthesized by homogeneous liquid-phase process and anealed at 300°C. Power X-ray diffraction (XRD), Thermogravimetric and differential scanning calorimetry (DG-DSC) were applied to investigate the thermal behavior, crystalline structural. Their voltammery characteristics, galvanostatic discharge and AC impedance spectroscopy were carried out in three-electrode mode composite electrodes. A specific capacitance approximately to 229 F/g could be achieved with NiO/MWNTS (10wt%) in the range of 0.27～0.5 V in 2 M KOH electrolyte. The NiO loaded on MWNTS was significantly improved the electrical conductivity and the active sites for redox reaction of metal oxide due to increasing its specific surface area by MWNTS.