Light energy storage and photoelectrochemical behavior of the titanate nanotube array/Ni(OH)2 electrode
✍ Scribed by W.K. Zhang; L. Wang; H. Huang; Y.P. Gan; C.T. Wang; X.Y. Tao
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 639 KB
- Volume
- 54
- Category
- Article
- ISSN
- 0013-4686
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✦ Synopsis
A new kind of TiO 2 nanotube array/Ni(OH) 2 (TiO 2 /Ni(OH) 2 ) composite electrode with the storage ability of light energy was prepared by the deposition of Ni(OH) 2 on the TiO 2 nanotube array, which was synthesized by anodizing Ti foils in an HF aqueous solution. SEM and XRD results showed that Ni(OH) 2 particles were well distributed on high density, well-ordered and uniform TiO 2 nanotube arrays. The photoelectrochemical properties of the TiO 2 /Ni(OH) 2 electrode were investigated in NaHCO 3 /NaOH buffer solution (pH 10) by means of UV-vis absorption spectra, cyclic voltammogram (CV) and photocurrent measurements. It was found that the TiO 2 /Ni(OH) 2 electrode was highly sensitive to light and exhibited excellent photoelectrochromic properties. Upon UV irradiation, the photogenerated holes by TiO 2 nanotube arrays can oxidize Ni(OH) 2 to NiOOH, and thus the TiO 2 /Ni(OH) 2 electrode can be photo-charged by light.