標題: One-Step Fabrication of Carbon Nanotubes Decorated with Graphitic Nanoflakes for Energy Storage Systems
作者: Hung, Tsung-Chi
Chen, Chia-Fu
Chen, Chien-Chung
Whang, Wha-Tzong
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: Nanotube;Nanoflake;Bias;Energy Storage System;Capacitance
公開日期: 1-七月-2010
摘要: We have used a bias-assisted microwave plasma chemical vapor deposition system to synthesize carbon nanotubes presenting graphitic nanoflakes, named coral-like carbon nanotubes, and well-aligned carbon nanotubes on carbon cloth substrates. Applying an external bias of -100 V led to the growth of well-aligned carbon nanotubes. In the absence of an external bias, the coral-like nanotubes presenting graphite nanoflakes were formed. The specific surface areas of the well-aligned and coral-like carbon nanotubes electrodes were 90.31 and 143.69 m(2)/g, respectively. In terms of energy storage, we estimated the capacitance of the coral-like carbon nanotube electrode to be ca. 194 F/g in an electrolyte of 1 M H(2)SO(4). This value is almost double that of the well-aligned carbon nanotubes electrode (104 F/g), presumably because the presence of the carbon nanoflakes had a positive influence on the migration and adsorption of ions within the electrode. The fitting results indicated that the coral-like carbon nanotubes electrode behaved as a traditional electrochemical capacitor. Durability tests revealed that the coral-like carbon nanotube electrode was reliable, with a decay of 9% in capacitance over 1000 cycles.
URI: http://dx.doi.org/10.1166/jnn.2010.1701
http://hdl.handle.net/11536/9123
ISSN: 1533-4880
DOI: 10.1166/jnn.2010.1701
期刊: JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume: 10
Issue: 7
起始頁: 4738
結束頁: 4742
顯示於類別:會議論文