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.
A Pt–Pb alloy nanoparticle/multi-walled carbon nanotube (Pt–Pb/MWCNT)
nanocomposite was prepared by electrodepositing Pt–Pb alloy onto MWCNTs that were
vertically aligned on Ta plates. The 10–40 nm diameter Pt–Pb alloy nanoparticles were
mainly deposited at the tips, and sparsely dispersed on the sidewalls of the bamboo-like
MWCNTs, as demonstrated by scanning electron microscopy, transmission electron
microscopy (TEM), and x-ray diffraction. The high resolution TEM (HRTEM) image
showed a snowflake-like morphology for the Pt–Pb nanoparticles. This Pt–Pb/MWCNT
nanocomposite exhibited much stronger electrocatalytic activity toward glucose oxidation
than pristine MWCNTs, Pt–Pb on glassy carbon, and Pt/MWCNT and Au/MWCNT
nanocomposites, in both neutral and alkaline solutions. This Pt–Pb/MWCNT
nanocomposite electrode is hence promising for development as a nonenzymatic glucose
sensor.
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