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Flexible Symmetric Supercapacitors Based on TiO$_2$ and Carbon Nanotubes

Flexible Symmetric Supercapacitors Based on TiO$_2$ and Carbon Nanotubes,10.1109/TNANO.2010.2069569,IEEE Transactions on Nanotechnology,Chung-Jen Chie

Flexible Symmetric Supercapacitors Based on TiO$_2$ and Carbon Nanotubes  
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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 TiO2 nanotubes with carbon nanotubes. Vertically oriented TiO2 nanotube arrays are fabricated by anodization process and used as porous pseudoca- pacitive electrode with compact density and large surface area. Conductive multiwall carbon nanotube networks are coated on the TiO2 nanotubes to form the hybrid electrode. With 1M H2 SO4 as electrolyte, the specific capacitance can be enhanced by about 30% as compared to pure carbon-nanotube electrode. Electrochemi- cal impedance spectroscopy shows good capacitive behavior for the device. This hybrid-electrode technique demonstrates also a promising application for flexible energy devices and electronics. Index Terms—Carbon nanotubes, supercapacitors, TiO2 nanotube.
Journal: IEEE Transactions on Nanotechnology - IEEE TRANS NANOTECHNOL , vol. 10, no. 4, pp. 706-709, 2011
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