In this study, non-noble metal Cd decorated cubic phase CdS (CdS/Cd) thin layer on a millimeter-scale chitosan-Mg(OH)₂ xerogel beads (CMB) were elaborately designed and successfully synthesized via facile hydrated electrons (e_aq^•−) assistant strategy. The in-situ formation of metallic Cd was driven by e_aq^•− generated from UV/Na₂SO₃ process. Owing to metallic Cd, CMB@CdS/Cd exhibited better visible-light absorption ability and more efficient separation capability for photo-induced carriers, its hydrogen production efficiency was about threefold improved compared to CMB@CdS. Both characterization methods and density functional theory calculations determined a built-in electric field from metallic Cd to CdS and Ohmic-contact between Cd and CdS, which largely promoted the carriers transfer efficiency. Moreover, the introduction of metallic Cd on the CdS could reduce the ΔG_H*, thus greatly boosting the photocatalytic hydrogen production efficiency. This work provides a simple and green approach to construct metallic Cd coupled semiconductor to achieve efficient photocatalytic applications.

在这项研究中，精心设计了毫米级壳聚糖-Mg(OH) ₂干凝胶珠 (CMB) 上非贵金属 Cd 装饰的立方相 CdS (CdS/Cd) 薄层，并通过简便的水合电子 (e _aq ^•- ) 辅助策​​略。在原位形成金属镉通过驱动ë_水溶液^{• -}从UV /钠产生₂ SO ₃过程。由于金属Cd，CMB@CdS/Cd表现出更好的可见光吸收能力和更有效的光致载流子分离能力，与CMB@CdS相比，其制氢效率提高了约三倍。表征方法和密度泛函理论计算确定了从金属 Cd 到 CdS 的内置电场以及 Cd 和 CdS 之间的欧姆接触，这在很大程度上提高了载流子转移效率。此外，在CdS上引入金属Cd可以降低ΔG _H*，从而大大提高光催化制氢效率。这项工作提供了一种简单而绿色的方法来构建金属 Cd 耦合半导体，以实现高效的光催化应用。