Kim, Byungwoo Chung, Haegeun Min, Byoung Koun Kim, Honggon Kim, Woong 2024-01-20T18:02:14Z 2024-01-20T18:02:14Z 2021-09-05 2010-12-20 0253-2964 https://pubs.kist.re.kr/handle/201004/130815 We demonstrate that vertically aligned carbon nanotubes can be synthesized directly on tantalum substrate via water-assisted 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 (similar to 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 similar to 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 supercapacitors English WILEY-V C H VERLAG GMBH DIRECT GROWTH SUPERCAPACITORS ELECTRODE FOILS Electrochemical Capacitors Based on Aligned Carbon Nanotubes Directly Synthesized on Tantalum Substrates Article 10.5012/bkcs.2010.31.12.3697 1 BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.31, no.12, pp.3697 - 3702 BULLETIN OF THE KOREAN CHEMICAL SOCIETY 31 12 3697 3702 scie scopus kci ART001526067 000286150900038 2-s2.0-78650384683 Chemistry, Multidisciplinary Chemistry Article DIRECT GROWTH SUPERCAPACITORS ELECTRODE FOILS Carbon nanotubes Chemical vapor deposition Tantalum Supercapacitors