Abstract TiO2 has gained increasing interest because of its outstanding properties and promising applications in various fields. In this study, we report a novel MoO2/MoS2/TiO2 sandwich heterostructure that was prepared by chemical vapor deposition (CVD) for highly efficient photocatalytic H2 generation. The sandwich structure, consisting of a MoS2 nanoflake layer and a MoO2 nanoplate layer with large specific surface area, was grown on TiO2 nanotube array electrodes. The MoO2 acts as a fast hole transport layer that promotes efficient charge separation. Since the MoO2/MoS2/TiO2 heterostructure has a nearly full-solar-spectrum absorption range, its photocatalytic activity for water splitting is enhanced, resulting in a H2 production rate of 110 μmol h−1 cm−2. This work provides a bottom-up strategy for preparing highly efficient sandwich-type photocatalysts.

中文翻译：

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三明治结构 MoO2/MoS2/TiO2 光催化剂可实现出色的析氢

摘要 TiO2因其优异的性能和在各个领域的应用前景而受到越来越多的关注。在这项研究中，我们报告了一种通过化学气相沉积 (CVD) 制备的新型 MoO2/MoS2/TiO2 夹心异质结构，用于高效光催化制氢。在TiO2纳米管阵列电极上生长了由具有大比表面积的MoS2纳米薄片层和MoO2纳米片层组成的三明治结构。MoO2 充当快速空穴传输层，促进有效的电荷分离。由于 MoO2/MoS2/TiO2 异质结构具有近乎全太阳光谱的吸收范围，其光催化分解水的活性增强，导致 H2 产率为 110 μmol h-1 cm-2。