The Preparation of Porous TiO[sub 2] by Immersing Ti in NaOH Solution

The formation of a porous layer by immersing Ti in 5 M NaOH at 303 K was investigated using electrochemical measurements, a scanning electron microscope, and grazing incident X-ray diffraction. The porous layer was readily obtained in the case of the presence of titanium hydride on the surface before immersion. The crystalline structure of the porous layer is composed of a mixture of the rutile and anatase type The porous layer is hard to produce without the presence of The is directly changed to by a dissolution reaction in alkaline solution. The presence of on the surface is an important factor for the preparation of the porous layer. © 2002 The Electrochemical Society. All rights reserved.