Developing highly active, recyclable, and inexpensive photocatalysts for hydrogen evolution reaction (HER) under visible light is significant for the direct conversion of solar energy into chemical fuels for various green energy applications. For such applications, it is very challenging but vitally important for a photocatalyst to simultaneously enhance the visible‐light absorption and suppress photogenerated electron–hole recombination, while also to maintain high stability and recyclability. Herein, a metal–organic framework (MOF)‐templated strategy has been developed to prepare heterostructured nanocatalysts with superior photocatalytic HER activity. Very uniquely, the synthesized photocatalytic materials can be recycled easily after use to restore the initial photocatalytic activity. It is shown that by controlling the calcination temperature and time with MOF‐5 as a host and guest thioacetamide as a sulfur source, the chemical compositions of the formed heterojunctions of ZnO/ZnS can be tuned to further enhance the visible‐light absorption and photocatalytic activity. The nanoscale heterojunction ZnO/ZnS structural feature serves to reduce the average free path of charge carriers and improve the charge separation efficiency, thus leading to significantly enhanced HER activity under visible‐light irradiation (λ > 420 nm) with high stability and recyclability without any cocatalyst.

中文翻译：

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金属-有机框架衍生的ZnO / ZnS异质纳米结构，用于高效可见光驱动的光催化制氢

开发用于可见光下氢气分解反应（HER）的高活性，可回收和廉价的光催化剂，对于将太阳能直接转化为各种绿色能源应用的化学燃料具有重要意义。对于这样的应用，光催化剂要同时增强可见光吸收并抑制光生电子-空穴复合，同时还要保持高稳定性和可回收性，是非常具有挑战性的，但至关重要。本文中，已开发出一种金属-有机框架（MOF）模板化的策略，以制备具有优异光催化HER活性的异结构纳米催化剂。非常独特的是，合成的光催化材料在使用后可以轻松地回收利用，以恢复初始的光催化活性。结果表明，通过以MOF-5为主体，以客体硫代乙酰胺为硫源控制煅烧温度和时间，可以调节形成的ZnO / ZnS异质结的化学组成，以进一步增强可见光吸收和光催化作用。活动。纳米级异质结ZnO / ZnS结构特征可降低电荷载流子的平均自由程并提高电荷分离效率，从而在可见光（λ> 420 nm）下具有显着增强的HER活性，并具有很高的稳定性和可回收性，而无需任何操作助催化剂。