MgO modified TiO2/WO3 dual-layer photocatalysts (DLP) was synthesized by radio-frequency magnetron sputtering (RFMS). The influences of MgO on the properties and the performance of the prepared DLP were investigated. MgO modified TiO2 thin films were characterized by instrumental analysis such as XRD, AFM, SEM-EDS, and UV-visible absorption spectrometry. Their photoactivity was assessed by conducting photovoltammetry followed by splitting water in a twin-cell reactor, where hydrogen gas and oxygen gas were produced separately. The yield of H2 and O2 in the twin-cell reactor corresponded to the photovoltammetry results, indicating that MgO can significantly improve the photoactivity of DLP. The improvement is attributed primarily to the hygroscopic Nature of MgO, which can increase the amount of H2O molecules on the surface of TiO2 for carrying out the photoreaction. In addition, the incorporated MgO layer can also act as an insulator to suppress the electron leakage that occurred at the TiO2-water interface.

中文翻译：

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使用吸湿性 MgO 修饰的 TiO2/WO3 双层光催化剂进行光催化分解水

通过射频磁控溅射 (RFMS) 合成了 MgO 改性的 TiO2/WO3 双层光催化剂 (DLP)。研究了MgO对制备的DLP的性质和性能的影响。通过XRD、AFM、SEM-EDS和紫外-可见吸收光谱等仪器分析对MgO改性的TiO2薄膜进行了表征。它们的光活性是通过进行光电伏安法然后在双电池反应器中分解水来评估的，其中氢气和氧气分别产生。双电池反应器中H2和O2的产率与光电伏安法结果一致，表明MgO可以显着提高DLP的光活性。这种改进主要归因于 MgO 的吸湿性，可以增加TiO2表面H2O分子的数量进行光反应。此外，引入的 MgO 层还可以作为绝缘体来抑制 TiO2-水界面处发生的电子泄漏。