中文摘要：

采用水热法在不锈钢基底上制备WO3纳米片阵列,然后将其浸渍于不同浓度Zn（NO3）2溶液中以负载ZnO纳米颗粒,从而制备出ZnO/WO3纳米片薄膜。采用场发射扫描电镜（FESEM）、X射线衍射 （XRD）、X射线光电子能谱（XPS）、紫外-可见吸收光谱（UV-Vis）和电化学阻抗图谱（EIS）等方法对ZnO/WO3复合薄膜的形貌、结构、物相组成和光电性能等进行分析,重点考察了薄膜电极对亚甲基蓝（MB）的光电催化降解性能。结果表明, WO3纳米片均匀垂直于基底生长,Zn元素以ZnO颗粒的形式分布在WO3表面；ZnO的引入促进了WO3中产生的光生电子-空穴对的分离,从而使ZnO/WO3复合薄膜表现出比纯WO3薄膜更优异的光电性能和光电催化活性；在Zn（NO3）2浸渍液浓度为20 mmol/L时,所制ZnO/WO3复合薄膜具有最佳的光电催化性能,在MB溶液初始浓度为10 mg/L、外加偏压为0.8 V、光照1 h的条件下,采用该样品对MB的降解率达96.5%,并且复合薄膜具有良好的循环稳定性,在重复使用5次后,对MB的光电催化降解效率没有明显降低,有望在实际污水处理中得到应用。

英文摘要：

WO3 nanosheet arrays were prepared on stainless steel substrate by hydrothermal reaction and then dipped in Zn（NO3）2 solutions with different concentrations to carry ZnO nanoparticles, so the ZnO/WO3 nanofilms were obtained.The films＇ morphology, microstructure, phase composition, photoelectric properties, especially the photoelectrocatalytic （PEC） degradation performance for methylene blue （MB） using ZnO/WO3 film as electrode, were examined by FESEM, XRD, XPS, UV-Vis and EIS. The results show that uniform WO3 nanosheets grow vertically on the substrate and Zn（Ⅱ） existing as ZnO nanoparticles spread over the surface of WO3. ZnO/WO3 composite material exhibits much improved photoelectric properties and PEC activity over WO3 nanosheet films because the introduction of ZnO facilitates the separation of photogenerated electron-hole pairs in WO3 nanosheets.ZnO/WO3 film prepared in 20 mmol/L Zn（NO3）2 solution has the best PEC performance. With this sample as film electrode, the removal rate of MB reaches 96.5% when initial mass concentration of MB is 10 mg/L, applied bias voltage is 0.8 V and visible light irradiation time is 1 h. No obvious reduction in PEC degradation efficiency for MB is observed after reusing for 5 times, so the composite films display excellent stability and are expected to be applied in wastewater treatment.