“…Meanwhile the photogenerated holes in the reaction medium react with the hole scavenger, reducing the chance of recombination. The contribution of each nanostructure can be interpreted as follows: The combination of hollow CoSe 2 nanostructures constructed from ZIF-67 nanostructures with porous morphology and internal cavities offers several light reflection centers to improve light absorption. , In the meantime, 1D CdS nanorods with a high aspect ratio and adequate band edge potentials enable charge carrier separation, while 2D WS 2 nanosheets with a large surface area provide an extensive number of active sites to trigger the water reduction reaction. , Together, CdS, WS 2 , and CoSe 2 form a heterojunction that has the synergistic effect of suppressing exciton recombination, allowing for charge transfer toward the CoSe 2 /WS 2 nanostructure, which acts as an electron sink and contribute for water-splitting to produce hydrogen. Additionally, the CoSe 2 /WS 2 nanostructures enhancing the durability of the CdS@CoSe 2 /WS 2 photocatalyst by lowering the chance of photo corrosion and deterioration.…”