Abstract Enhancing the separation efficiency of photogenerated carriers is propitious for the promotion of photocatalytic hydrogen production from formic acid decomposition. Herein, MoS2/Zn3In2S6 (MoS2/ZIS6) composite photocatalysts containing varying mass percentages of MoS2 were obtained by a straightforward synthetic method. The results confirmed that MoS2, as a cocatalyst, markedly promoted the photogenerated charge separation efficiency and visible light-driven hydrogen production activity of ZIS6 (λ > 400 nm). Specifically, the as-prepared 0.5% MoS2/ZIS6 photocatalyst exhibited the highest photocatalytic hydrogen production rate (74.25 µmol·h−1), which was approximately 4.3 times higher than that of ZIS6 (17.47 µmol·h−1). The excellent performance of the 0.5% MoS2/ZIS6 photocatalyst may be due to the fact that MoS2 has a low Fermi energy level and can thus enrich photogenerated electrons from ZIS6, and furthermore reduce H+ derived from formic acid, to form hydrogen. The structure and morphology of the MoS2/ZIS6 photocatalysts and the reactive species were determined by X-ray diffraction, transmission electron microscopy, and field emission scanning electron microscopy, among others; a plausible mechanistic rationale is discussed based on the results.

中文翻译：

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MoS2/Zn3In2S6 复合光催化剂用于增强可见光驱动的甲酸制氢

摘要 提高光生载流子的分离效率有利于促进甲酸分解光催化制氢。在此，通过简单的合成方法获得了含有不同质量百分比的 MoS2 的 MoS2/Zn3In2S6（MoS2/ZIS6）复合光催化剂。结果证实，MoS2作为助催化剂显着提高了ZIS6（λ> 400 nm）的光生电荷分离效率和可见光驱动的制氢活性。具体而言，所制备的 0.5% MoS2/ZIS6 光催化剂表现出最高的光催化产氢速率（74.25 µmol·h-1），大约是 ZIS6（17.47 µmol·h-1）的 4.3 倍。0的优异表现。5% MoS2/ZIS6 光催化剂可能是由于 MoS2 具有较低的费米能级，因此可以丰富 ZIS6 的光生电子，并进一步还原甲酸衍生的 H+，形成氢。MoS2/ZIS6 光催化剂和反应物种的结构和形貌通过 X 射线衍射、透射电子显微镜和场发射扫描电子显微镜等确定；根据结果​​讨论了一个合理的机械原理。