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Flexible Symmetric Supercapacitors Based on TiO _2 and Carbon Nanotubes

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5 Author(s)
Chien, Chung-Jen ; Depts. of Phys. & Electrophys., Univ. of Southern California, Los Angeles, CA, USA ; Deora, S.S. ; Paichun Chang ; Dongdong Li
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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 pseudocapacitive 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 H2SO4 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.

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Nanotechnology, IEEE Transactions on  (Volume:10 ,  Issue: 4 )