中文摘要：

采用sol-gel法制备了Zn2＋离子掺杂的锐钛矿相纳米TiO2薄膜电极。通过X射线衍射（XRD）、吸收光谱、原子力显微镜（AFM）,结合光电流作用谱研究了Zn2＋离子掺杂对TiO2薄膜电极表面形貌和紫外光电性能的影响。结果表明,在所选浓度范围内,Zn2＋离子掺杂浓度对薄膜的相组成和紫外光吸收强度无明显作用,但可显著改变薄膜表面颗粒大小和形貌特征,从而影响电极光电性能。0.1%（摩尔分数）Zn2＋离子的掺杂使膜内颗粒尺寸由30nm增大至40nm,同时使表面颗粒的生长具有一定的择优取向,颗粒形状由本征薄膜的类球形变为垂直于膜面的柱状颗粒。这一结构大幅增大了薄膜的表面积,提高了载流子在固-液界面的传输效率,促使电极光电流密度（PCD）比本征电极提高40%。随掺杂浓度的提高,表面颗粒尺寸逐渐增大,形状恢复为类球形,电极光电性能有所降低。当掺杂浓度达到5%（摩尔分数）时,颗粒粒径急剧增大至130nm,表面颗粒因熔点降低而熔合成无孔表面,导致电极PCD急剧降低。

英文摘要：

The Zn2＋-doped nanocrystalline anatase-type TiO2film electrodes were prepared by sol-gel method. The effect of Zn2＋ion doping on the surface morphology and photoelectric properties of the electrodes were studied by X-ray diffraction（XRD）,absorption spectra,atom force microscope and photocurrent action spectra.The results show that,the Zn2＋ion doping content shows no obvious effect on the phase composition and UV absorption strength of the films,but shows remarkable influence on the size and morphology of the grains in the films,this makes the photoelectric properties of the electrode vary significantly.When doping content increase to 0.1mol%,the grain size of the film increases from 30to 40nm,and the shape of the grains also changes from near-spherical to prismatical structure.This special structure change significantly increases the surface area of the film,and remarkablely improves the transfer efficiency of the carriers on the solid-liquid interface, resulting in a 40% enhancement on electrode photocurrent density（PCD）compare with intrinsic electrode. However,as the doping content is increased,the grain size of the film increases gradually and the grain shape resumes to near-spherical,which make the electrode PCD decrease obviously.When the Zn2＋ion content increases to 5mol%,the grain size rapidly increases to 130nm,at the same time,the surface grains of the film melt and form a smooth surface,these lead to a rapid reduce on the electrode PCD.