Co-catalysis is regarded as a promising strategy to improve the hydrogen evolution performance of semiconductor-based photocatalysts. But developing a simple and effective technique to achieve the optimal synergy between co-catalysts and host photocatalysts has been a great challenge. Herein, hybrid photocatalysts consisting of β-NiS modified CdS nanowires (NiS/CdS NWs) have been synthesized via a simple and green hydrothermal route using CdS NWs as the template from thiourea and nickel acetate in the presence of sodium hypophosphite. As a result, a metal Ni intermediate was formed via an electroless plating process assisted by H₂PO₂⁻, which facilitated the growth of highly conducting flake-like β-NiS nanostructures onto the surface of the CdS NWs. With the optimal loading amount of NiS, the obtained NiS/CdS NWs present a record-high photocatalytic activity for H₂ evolution in lactic acid aqueous solutions under visible light irradiation. At 25 °C, the rate of H₂ evolution was measured as 793.6 μmol h⁻¹ (over a 5 mg photocatalyst sample), which is nearly 250-fold higher than that over pure CdS NWs, and the apparent quantum yield reached an exceptionally high value of 74.1% at 420 nm. The mechanism for the photocatalytic H₂ evolution over the present NiS/CdS NWs was also proposed. This strategy would provide new insight into the design and development of high-performance heterostructured photocatalysts.

中文翻译：

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β-NiS修饰的CdS纳米线以极高的效率用于光催化H _2的放出†

共催化被认为是改善基于半导体的光催化剂的氢释放性能的有前途的策略。但是，开发一种简单有效的技术以实现助催化剂和主体光催化剂之间的最佳协同作用一直是一个巨大的挑战。在本文中，在次磷酸钠存在下，由硫脲和乙酸镍通过CdS NWs为模板，通过简单且绿色的水热途径，通过简单且绿色的水热途径合成了由β-NiS修饰的CdS纳米线（NiS / CdS NWs）组成的杂化光催化剂。其结果是，金属镍中间产物形成通过由H辅助无电镀工艺₂ PO ₂ ^-，这促进了高导电性的片状β-NiS纳米结构在CdS NWs表面上的生长。以最佳的NiS负载量，所获得的NiS / CdS NWs在可见光照射下对乳酸水溶液中H _2的析出具有创纪录的高光催化活性。在25°C下，测得的H ₂释放速率为793.6μmolh ^-1（在5 mg光催化剂样品上），比纯CdS NW高出近250倍，并且表观量子产率达到了异常在420 nm处具有74.1％的高值。H ₂的光催化机理还提出了目前的NiS / CdS NWs的演变。该策略将为高性能异结构光催化剂的设计和开发提供新的见识。