標題: Electrochemical Capacitors of Horizontally Aligned Carbon Nanotube Electrodes with Oxygen Plasma Treatment
作者: Wang, Kuang-Yu
Chiu, Yu-Kai
Cheng, Huang-Chung
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
公開日期: 1-Jan-2017
摘要: A electrochemical capacitor (EC) composed of horizontally aligned carbon nanotube (HACNT) electrodes treated with oxygen plasma has been successfully shown to achieve superior specific capacitance. Cyclic voltammetry (CV) measurement reveals that the HACNT thin films on the Si substrate modified by the oxygen plasma with a bias power of 60 W obtain the highest specific capacitance of 6.81 mF/cm(2), which is 5.6 times that of non-plasma-treated ones. Such improvement can be attributed to the increase of oxygen-containing functional groups, such as C-OH, C=O, and COOH as well as to structural defects which remarkably increase the extra redox reactions to enhance the specific capacitance. The electrochemical stabilities of the oxygen-plasma-treated (OPT) HACNT thin films were also verified. Finally, the OPT HACNT thin films were transferred to the flexible PET thin foil and still achieved characteristics similar to those on the hard Si substrate. Even after a bending test of 200 bends with a bending radius of 1 cm and bending angle of 90 degrees, the variation of specific capacitance is less than 3% for such flexible ECs. The electrochemical stability of the OPT HACNT thin films after mechanical bending is equal to that of the Si substrate. This shows that such OPT HACNT ECs have promise for the future flexible applications in the energy storage field. (C) The Author(s) 2017. Published by ECS. All rights reserved.
URI: http://dx.doi.org/10.1149/2.1251707jes
http://hdl.handle.net/11536/145727
ISSN: 0013-4651
DOI: 10.1149/2.1251707jes
期刊: JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume: 164
Appears in Collections:Articles