Size Controlled Nickel Oxide Nanoparticles on Carbon Nanotubes for Supercapacitor Electrode
Abstract:We have synthesized supercapacitor electrodes fashioned of NiO x /multiwalled carbon nanotubes (MWNTs), in which the controlled NiO x nanoparticles were prepared via a simple colloidal method and supported on the MWNTs. The sizes of the NiO x nanoparticles on MWNTs were systematically varied from 4to 14nm at a fixed metal loading of 20 wt% by changing sintering temperature in a controlled manner. The maximum specific capacitance of the NiO x /MWNTs was measured to be ca. 215 F per unit gram of NiO x /MWNTs by cyclic voltammetry (CV) in an aqueous 1 M KOH electrolyte, demonstrating that the specific capacitance of the MWNTs-supported nanosize NiO x is strongly dependent on the dispersion and size of the nanoparticles for the supercapacitor performance.
Document Type: Research Article
Publication date: 2008-10-01
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