3d过渡金属掺杂TiO2纳米晶膜电极的光电化学研究

摘要

应用原子力显微镜和x射线粉末法对3d过渡金属离子Cr(Ⅲ)，Fe(Ⅲ)，Mn(Ⅱ)，Co(Ⅱ)，Ni(Ⅱ)，Cu(Ⅱ)和Zn(Ⅱ)掺杂TiO2纳米晶粒(简写为M3d-TiO2)作了表征，并用光电化学方法研究了M3d-TiO2纳米结构多孔膜电极.实验结果表明，M3d-TiO2纳米粒子的颗粒较均匀，粒径约为15 nm，其晶型为锐钛矿和板钛矿的混晶.在所研究的M3d-TiO2中，只有Zn2+-TiO2电极的光电流大于未掺杂的TiO2纳米结构多孔膜电极.3d金属离子的掺杂引起各电极的光电流信号在一定波长范围内出现p-n转型现象.%The 3d transition metal ions [Cr(Ⅲ), Fe(Ⅲ), Mn (Ⅱ), Co(Ⅱ), Ni(Ⅱ), Cu(Ⅱ), Zn(Ⅱ)]nanocrystalline doped with TiO2(abbr. M3d-TiO2) were characterized by AFM and XRD. The M3d-TiO2 nanostructured film electroede was prepared and investigated with photoelectrochemical techniques. The results show that the size of M~-TiO2 nanocrystalline particles was quite uniform and the radii were about 15 nm. The M3d-TiO2 nanocrystalline particles were a mixture of brookite and anatase crystal forms. Of all the M3D-TiO2 investigated in this paper, however, the photocurrent intensity of Zn2+-TiO2 nanostructured film electode was higher than that of the electrode undoped with TiO2. The phenomenon of p-n type inversion was observed in certain wavelength range, which was caused by 3d transition ions doping.