Abstract
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.
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