2D/3D ZIF-9/Mo15S19 S-Scheme Heterojunction for Productive Photocatalytic Hydrogen Evolution

Flower-like Mo15S19 nanoparticles are successfully attached on the surface of the lamellar cobalt-based zeolite imidazole framework (ZIF-9) according to the physical mixing process herein described. The existence of lamellar ZIF-9 not only avoids the stacking of spherical flower-like Mo15S19 nanoparticles but also enhances the adsorbability of the ZIF-9/Mo15S19 system for Eosin-Y (EY) molecules, which injects more vitality into the hydrogen production reaction. In addition, the lamellar ZIF-9 can be freely stacked and form a regular rich wrinkle structure. Benefitting from this special structure, Mo15S19 nanoparticles with spherical flower-like shape can be adsorbed more firmly between the layers of ZIF-9. This 2D/3D interlaced structure makes the system more stable, which also can improve the adsorption capacity of EY molecules. In addition, the construction of an S-scheme heterojunction between ZIF-9 and Mo15S19 is another nonnegligible driving force for the enhanced photocatalytic performance in this system. The rational establishment of the S-scheme heterojunction provides a more convenient transmission channel for the photogenerated charge. This work uses ZIF-9 as the carrier of Mo15S19 and promotes the catalytic performance of the composite ZIF-9/Mo15S19 by adjusting the evacuation of the spherical Mo15S19 nanoparticles and constructing a heterojunction that can promote the flow ability of charges.