Abstract:

TiO₂ nanotube arrays  were prepared by means of anodizing method on the surface of titanium films. The packed n\|type TiO₂ tubes have  an inner pore diameter of 60—90 nm, a wall thickness of approximately 15 nm and a length of 600 nm. The NiO/TiO₂ heterojunction electrode was synthesized by means of electroless plating and annealing which resulted in TiO₂ nanotube arrays coated with a layer (about 200 nm in thickness) of NiO particles (20—40 nm). The results show that  NiO/TiO₂ heterojunction electrode  enhanced photoelectrochemical property under 100 mW/cm2 irradiation. The photocurrent density is 3.05 mA/cm2, and photoelectricity conversion efficiency is 1.41％ at a bias voltage of 0.65 V.

Key words: TiO₂ nanotube arrays, NiO/TiO₂ heterojunction electrode, UV-Vis absorbance, photoelectrochemical property