Photocatalytic decomposition of water for hydrogen production is considered a promising solution to address the issues of energy crisis and environmental pollution. Herein, a kind of novel hollow flower-like 0D/3D Zn_0.5Cd_0.5S/NiCoZn-LDH with an n-n heterojunction is synthesized via precipitation and cation-exchange methods. Photocatalytic experiments reveal that the composite photocatalyst exhibits excellent performance compared with pure Zn_0.5Cd_0.5S. In other words, the composite photocatalyst shows enhanced response to visible light, three-fold increased transient photocurrent, and the hydrogen production rate reaching to 1100 μmol/h/g, approximately 7.3 times higher relative to pure Zn_0.5Cd_0.5S. The reaction mechanism is also elucidated. Zn_0.5Cd_0.5S/NiCoZn-LDH shows a type II n-n heterojunction, which can effectively transfer and separate the photo-generated electrons and holes, and is beneficial for the photocatalytic hydrogen production reaction. The synthesized composite photocatalyst is prepared using a simple method, enabling future large-scale production and applications.

光催化分解水制氢被认为是解决能源危机和环境污染问题的有前景的解决方案。在此，通过沉淀法和阳离子交换法合成了一种具有nn异质结的新型空心花状0D/3D Zn _0.5 Cd _0.5 S/NiCoZn-LDH。光催化实验表明，与纯Zn _0.5 Cd _0.5 S相比，该复合光催化剂表现出优异的性能。换句话说，该复合光催化剂对可见光的响应增强，瞬态光电流增加三倍，产氢速率达到1100 μmol/ h/g，比纯 Zn _0.5 Cd高约 7.3 倍_0.5 S。还阐明了反应机理。Zn _0.5 Cd _0.5 S/NiCoZn-LDH显示出II型nn异质结，可以有效地转移和分离光生电子和空穴，有利于光催化制氢反应。合成的复合光催化剂制备方法简单，未来可大规模生产和应用。