Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/29793
Title: Enhanced charge storage by the electrocatalytic effect of anodic TiO2 nanotubes
Authors: Zhang, G
Huang, C
Zhou, L 
Ye, L
Li, W
Huang, H 
Issue Date: 2011
Publisher: Royal Soc Chemistry
Source: Nanoscale, 2011, v. 3, no. 10, p. 4174-4181 How to cite?
Journal: Nanoscale 
Abstract: Ordered titania nanotube (TNT) arrays were fabricated by anodization of titanium with a very fast voltage ramp speed. Co(OH)(2)/TNT nanocomposite was synthesized by cathodic deposition using the as-anodized TNT as the substrate. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) were used to characterize the morphology, crystalline structure and chemical state. The capacitive characteristics were investigated by cyclic voltammetry (CV), charge-discharge tests, and electrochemical impedance spectroscopy (EIS). Thanks to the electrocatalytic effect of the as-anodized TNTs on the reduction of Co(OH)(2), the Co(OH)(2)/TNT composite electrode exhibits a significantly enhanced charge storage capacity (an increase of 73%) when compared with Co(OH)(2)/Ti (titanium as the deposition substrate). The occurrence of such an electrocatalytic effect is suggested to be related to the nano-sized TiO2 crystals (rutile) embedded in organized amorphous TNTs. Co(OH)(2)/TNT demonstrates enhanced specific energy, high rate capability and good cyclability, and can be a potential electrode of choice for supercapacitors.
URI: http://hdl.handle.net/10397/29793
ISSN: 2040-3364
DOI: 10.1039/c1nr10561b
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