Electrochemical Capacitors Based on Aligned Carbon Nanotubes Directly Synthesized on Tantalum Substrates
- Electrochemical Capacitors Based on Aligned Carbon Nanotubes Directly Synthesized on Tantalum Substrates
- Byungwoo Kim; Haegeun Chung; 민병권; 김홍곤; 김웅
- carbon nanotubes; capacitors; Chemical vapor deposition; Tantalum; Supercapacitors; *2010개인평가에 반영완료
- Issue Date
- Bulletin of the Korean Chemical Society
- VOL 31, NO 12, 3697-3702
- We demonstrate that vertically aligned carbon nanotubes can be synthesized directly on tantalum substrate via waterassisted
chemical vapor deposition and evaluate their properties as electrochemical capacitors. The mean diameter of
the carbon nanotubes was 7.1 ± 1.5 nm, and 70% of them had double walls. The intensity ratio of G-band to D-band in
Raman spectra was as high as 5, indicating good quality of the carbon nanotubes. Owing to the alignment and low equivalent
series resistance, the carbon nanotube based supercapacitors showed good rate performance. Rectangular shape
of cyclic voltammogram was maintained even at the scan rate of > 1 V/s in 1 M sulfuric acid aqueous solution. Specific
capacitance was well-retained (~94%) even when the discharging current density dramatically increased up to 145 A/g.
Consequently, specific power as high as 60 kW/kg was obtained from as-grown carbon nanotubes in aqueous solution.
Maximum specific energy of ~20 Wh/kg was obtained when carbon nanotubes were electrochemically oxidized and
operated in organic solution. Demonstration of direct synthesis of carbon nanotubes on tantalum current collectors and
their applications as supercapacitors could be an invaluable basis for fabrication of high performance carbon nanotube
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