Size controlled nickel oxide nanoparticles on carbon nanotubes for supercapacitor electrode.
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 4 to 14 nm 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.
Nam
Sang Hoon
SH
Department of Materials Science and Engineering and Program for Integrated Molecular Systems (PIMS), Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Gwangju 500-712, South Korea.
Kim
Youn-Su
YS
Shim
Hee-Sang
HS
Choi
Sung Mook
SM
Kim
Hae Jin
HJ
Kim
Won Bae
WB