Cadmium sulfide (CdS) is a member of an important subgroup of two-dimensional (2D) transition metal dichalcogenides that can promote a number of useful oxidation reactions under visible light and ultrasonic vibrations. Herein, we report a low-cost hydrothermal method assisted by DL-dithiothreitol for controlling the thickness of CdS nanosheets. In particular, square-like CdS nanosheets with a thickness of 28 nm were acquired at a molar ratio of 2:1 of DL-dithiothreitol to a cadmium source. Furthermore, a significant connection was observed between CdS nanosheet thickness and photocatalytic H2 evolution. Thin square nanosheets exhibited high photocatalytic activity under the combination of light and vibrational energy. These nanosheets can be assigned to active sites due to an increase in surface area and can induce a piezoelectric field in CdS via ultrasound. Thickness differences exert a critical synergy effect on photo/piezo-bi-catalyst performance. The thinnest product achieved the maximum photocatalytic H2 production yield (1293.62 μmol g–1 h−1), which is approximately 4.2 times that of the 0-CdS micro-sheets (284.26 μmol g–1 h−1). This report illustrates the effect of CdS nanosheet thickness on photo/piezo-bi-catalytic H2-production operation and provides inspiration for engineers to develop high-efficiency two-dimension photocatalysts.

中文翻译：

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方形 CdS 微/纳米片作为用于制氢的高效光/压电双催化剂

硫化镉 (CdS) 是二维 (2D) 过渡金属二硫属化物的一个重要亚组的成员，可在可见光和超声波振动下促进许多有用的氧化反应。在此，我们报告了一种由 DL-二硫苏糖醇辅助控制 CdS 纳米片厚度的低成本水热方法。特别是，以 2:1 的 DL-二硫苏糖醇与镉源的摩尔比获得了厚度为 28 nm 的方形 CdS 纳米片。此外，还观察到 CdS 纳米片厚度与光催化 H2 析出之间存在显着联系。薄方形纳米片在光能和振动能的结合下表现出很高的光催化活性。由于表面积的增加，这些纳米片可以分配到活性位点，并且可以通过超声波在 CdS 中产生压电场。厚度差异对光/压电双催化剂性能产生关键的协同效应。最薄的产品实现了最大的光催化制氢产率（1293.62 μmol g-1 h-1），大约是 0-CdS 微片（284.26 μmol g-1 h-1）的 4.2 倍。本报告阐述了 CdS 纳米片厚度对光/压电双催化制氢操作的影响，并为工程师开发高效二维光催化剂提供了灵感。这大约是 0-CdS 微片（284.26 μmol g-1 h-1）的 4.2 倍。本报告阐述了 CdS 纳米片厚度对光/压电双催化制氢操作的影响，并为工程师开发高效二维光催化剂提供了灵感。这大约是 0-CdS 微片（284.26 μmol g-1 h-1）的 4.2 倍。本报告阐述了 CdS 纳米片厚度对光/压电双催化制氢操作的影响，并为工程师开发高效二维光催化剂提供了灵感。