Efficient photoinduced charge separation achieving an extremely long lifetime for improving the photocatalytic activity in hydrogen evolution reaction (HER) is essential to obtain high performance. Here, we crafted and designed the gemstone nanoflower-shaped ZnInS/CuS (ZIS/CuS) heterostructure by the n-type ZIS nanoparticles grown on p-type CuS nanoflowers. The ZIS/CuS exhibited the photocatalytic HER rate of 1659 μmol∙g∙h under visible light irradiation which was higher than that of ZIS nanoflower and CuS gemstone-shape. It has been attributed to the formation of type-II-scheme p−n heterojunction structure with a strong interfacial build-in electric field and the efficient photoinduced charge separation up to an ultralong lifetime of 4.89 ms. It was directly demonstrated by the in-situ X-ray photoelectron spectroscopy and femtosecond-million second transient absorption spectra (fs-ms TAS). This study provides a new strategy for constructing type-II p−n heterostructures with high photocatalytic activity and strong stability for photocatalytic HER.

中文翻译：

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具有超长光生载流子寿命的宝石纳米花状 ZnIn2S4/CuS 异质结用于光催化析氢

有效的光致电荷分离实现极长的寿命以提高析氢反应（HER）中的光催化活性对于获得高性能至关重要。在这里，我们通过在 p 型 CuS 纳米花上生长的 n 型 ZIS 纳米颗粒精心制作和设计了宝石纳米花形状的 ZnInS/CuS (ZIS/CuS) 异质结构。 ZIS/CuS在可见光照射下表现出1659 μmol∙g∙h的光催化HER速率，高于ZIS纳米花和宝石状CuS。这归因于形成了具有强界面内置电场的 II 型 p−n 异质结结构以及高达 4.89 ms 的超长寿命的有效光致电荷分离。原位X射线光电子能谱和飞秒-百万秒瞬态吸收光谱（fs-ms TAS）直接证明了这一点。该研究为构建具有高光催化活性和强光催化HER稳定性的II型p−n异质结构提供了新的策略。