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Preparation and Characterization of Aligned Carbon Nanotube–Ruthenium Oxide Nanocomposites for Supercapacitors
Author(s) -
Ye JianShan,
Cui Hui Fang,
Liu Xiao,
Lim Tit Meng,
Zhang WeiDe,
Sheu FwuShan
Publication year - 2005
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.200400137
Subject(s) - ruthenium oxide , materials science , supercapacitor , nanocomposite , carbon nanotube , cyclic voltammetry , scanning electron microscope , electrode , nanotechnology , chemical engineering , transmission electron microscopy , nanotube , ruthenium , electrochemistry , composite material , chemistry , organic chemistry , engineering , catalysis
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.