Flexible Symmetric Supercapacitors Based on TiO[Formula Omitted] and Carbon Nanotubes

• Published in: IEEE transactions on nanotechnology Vol. 10; no. 4; p. 706
• Main Authors: Chien, Chung-Jen, Deora, Suvil Singh, Chang, Paichun, Li, Dongdong, Lu, Jia Grace
• Format: Journal Article
• Language: English
• Published: New York The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 01.07.2011
• DOI: 10.1109/TNANO.2010.2069569
• ISSN: 1536-125X

Highly conducting carbon nanotube has been widely studied as electrode in double-layer-effect supercapacitors. In this paper, we introduce a hybrid-electrode design to further improve the specific capacitance by incorporating TiO [Formula Omitted] nanotubes with carbon nanotubes. Vertically oriented TiO [Formula Omitted] nanotube arrays are fabricated by anodization process and used as porous pseudocapacitive electrode with compact density and large surface area. Conductive multiwall carbon nanotube networks are coated on the TiO[Formula Omitted] nanotubes to form the hybrid electrode. With 1M H[Formula Omitted]SO[Formula Omitted] as electrolyte, the specific capacitance can be enhanced by about 30% as compared to pure carbon-nanotube electrode. Electrochemical impedance spectroscopy shows good capacitive behavior for the device. This hybrid-electrode technique demonstrates also a promising application for flexible energy devices and electronics.