Preparation and characterization of aligned carbon nanotube-ruthenium oxide nanocomposites for supercapacitors.
A novel type of ruthenium oxide (RuO(2))-modified multi-walled carbon nanotube (MWNT) nanocomposite electrode (RuO(2)/MWNT) for supercapacitors has been prepared. The nanocomposites were formed by depositing Ru by magnetic-sputtering in an Ar/O(2) atmosphere onto MWNTs, which were synthesized on Ta plates by chemical vapor deposition. Cyclic voltammetry, chronopotentiometry, and electrochemical impedance measurements were applied to investigate the performance of the RuO(2)/MWNT nanocomposite electrodes. The capacitance of the MWNT electrodes in 1.0 M H(2)SO(4) is significantly increased from 0.35 to 16.94 mF cm(-2) by modification with RuO(2). The RuO(2) film on the surface of the nanotubes is composed of small crystal grains with tilted bundle-like microstructures, as observed by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The results demonstrate a promising route to prepare RuO(2)/MWNT-based double-layer supercapacitors.
Ye
Jian-Shan
JS
Department of Biological Sciences, National University of Singapore, 14 Science Drive 4, Singapore 117543, Singapore.
Cui
Hui Fang
HF
Liu
Xiao
X
Lim
Tit Meng
TM
Zhang
Wei-De
WD
Sheu
Fwu-Shan
FS
D004563:Electrochemistry / Q000379:methods; D004566:Electrodes; D008280:Magnetics; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D053761:Nanocomposites / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry; D036103:Nanotechnology / Q000295:instrumentation / Q000379:methods*; D043942:Nanotubes; D037742:Nanotubes, Carbon / Q000737:chemistry*; D053770:Nanowires / Q000737:chemistry; D010087:Oxides / Q000737:chemistry; D017975:Ruthenium Compounds / Q000737:chemistry*; D014961:X-Ray Diffraction
D037742:Nanotubes, Carbon; D010087:Oxides; D017975:Ruthenium Compounds; C027646:ruthenium tetraoxide