4. Conclusion
Summarily, hierarchical CoP/ZnCdS/Co3O4QDs bi-heterostructure cages was constructed by integrating about 800 nm CoP polyhedron, 40 nm ZnCdS nanoparticles and 4.5 nm Co3O4 QDs into all-in-one as an ultrahigh-performance photocatalyst for visible-light-driven water splitting. What’s more, the development of the two parallel electron-transfer pathways in the bi-heterostructured CoP/ZnCdS/Co3O4 QDs cages makes photo-excited charges in ZnCdS be used seriously to the hydrogen evolution reaction. Undoubtedly, both semi-metallic CoP and three-dimensionally confined Co3O4 QDs as electron traps efficiently separated and transferred charges in photocatalytic water-splitting reaction. Besides, the CoP/ZnCdS/Co3O4 QDs photocatalyst not only exhibited high-efficiency H2-evolution but also favorable recycling stability.