CdS and layered double hydroxides (LDHs) have drawn wide attention for photocatalytic water decomposition due to their abundant structure and excellent properties. The construction of a heterogeneous structure is a widely used method for a single material to overcome their narrow spectral light response and inefficient charge separation. In this work, a CdS/CoAl LDH step-scheme (S-scheme) heterojunction photocatalyst was successfully constructed by coupling CdS and CoAl LDH based on the complementary properties of the two materials. Compared with single CdS and CoAl LDH, the prepared CdS/CoAl LDH composite photocatalyst shows excellent photocatalytic hydrogen production efficiency by efficient use of electrons and holes under visible light irradiation. A significant number of electrons in the S-scheme heterojunction photocatalyst can be efficiently used to participate in water splitting while the holes were consumed by the sacrificial reagent. Therefore, the building of the S-scheme heterojunction eventually improved the efficiency of photocatalyst hydrogen production by efficiently separating electrons and holes. At the same time, our work will provide a new approach for the practical application of such semiconductors.

CdS和层状双氢氧化物（LDHs）由于其丰富的结构和优异的性能而在光催化水分解方面引起了广泛关注。构建异质结构是一种广泛使用的单一材料克服光谱光响应窄和电荷分离效率低下的方法。在这项工作中，基于两种材料的互补性质，通过耦合 CdS 和 CoAl LDH 成功构建了 CdS/CoAl LDH 阶梯式（S-scheme）异质结光催化剂。与单一的 CdS 和 CoAl LDH 相比，制备的 CdS/CoAl LDH 复合光催化剂通过在可见光照射下有效利用电子和空穴显示出优异的光催化制氢效率。S型异质结光催化剂中的大量电子可以有效地用于参与水分解，而空穴被牺牲试剂消耗。因此，S型异质结的构建最终通过有效分离电子和空穴来提高光催化剂制氢的效率。同时，我们的工作将为此类半导体的实际应用提供一种新方法。