To fabricate an efficient two-component Z-scheme system for visible light induced overall water splitting, CdS/WO₃ nanocomposites, with cubic CdS nanoparticles grown on the surface of hexagonal WO₃ nanorods, were prepared via a facile precipitation of Cd²⁺ with S²⁻ in the presence of pre-obtained hexagonal WO₃ nanorods. MnO₂ and MoS₂, the co-catalysts for O₂ and H₂ generation respectively, were selectively deposited on WO₃ and CdS in the CdS/WO₃ nanocomposites. The resultant MoS₂–CdS/WO₃–MnO₂ composites show photocatalytic activity for overall water splitting under visible light, with an optimized performance observed over 2.0%MoS₂-0.2 CdS/WO₃-1.0%MnO₂. The visible light induced overall water splitting over MoS₂–CdS/WO₃–MnO₂ nanocomposites can be attributed to the presence of a Z-scheme charge transfer pathway in the CdS/WO₃ nanocomposites, ie, the transfer of the photo-generated electrons from the CB of WO₃ to the VB of CdS to recombine with the photo-generated holes through an efficient interface between cubic CdS and hexagonal WO₃. The left photo-generated holes in VB of WO₃ and the photo-generated electrons in CB of CdS therefore can accomplish the water oxidation and water reduction simultaneously, with the assistance of the surface deposited cocatalysts (MnO₂ and MoS₂). This work demonstrated the great potential of fabricating the two-component direct Z-scheme photocatalytic systems for overall water splitting from two semiconductors with a staggered band structure.

为了制造用于可见光引起的总水分解的有效的两组分Z方案系统，通过Cd ^2+的快速沉淀制备了CdS / WO ₃纳米复合材料，在六角形WO ₃纳米棒的表面上生长了立方CdS纳米颗粒。在预先获得的六角形WO ₃纳米棒的存在下的S ²⁻。分别用于生成O ₂和H ₂的助催化剂MnO ₂和MoS ₂选择性沉积在CdS / WO ₃纳米复合材料的WO ₃和CdS上。生成的MoS ₂ -CdS / WO ₃ -MnO_2种复合材料在可见光下显示了对整个水分解的光催化活性，在2.0％MoS ₂ -0.2 CdS / WO ₃ -1.0％MnO _2上观察到了最佳性能。MoS ₂ -CdS / WO ₃ -MnO ₂纳米复合材料上可见光诱导的总水分解可归因于CdS / WO ₃纳米复合材料中存在Z方案电荷转移途径，即光生的转移电子从WO ₃的CB到CdS的VB通过立方CdS和六角形WO ₃之间的有效界面与光生空穴复合。WO的VB中左侧的光生孔因此，在表面沉积的助催化剂（MnO ₂和MoS ₂）的帮助下，CdS _3中的光生电子和CdS CB中的光生电子可以同时完成水的氧化和水的还原。这项工作证明了制造由两个具有交错带结构的半导体进行总水分解的两组分直接Z方案光催化系统的巨大潜力。