Fabrication of Ultrathin Two-Dimensional/Two-Dimensional MoS₂/ZnIn₂S₄ Hybrid Nanosheets for Highly Efficient Visible-Light-Driven Photocatalytic Hydrogen Evolution

Ultrathin (ut) two-dimensional (2D) ZnIn2S4 (ZIS) nanosheets have exhibited great potential in photocatalytic hydrogen evolution. Herein, ultrathin 2D/2D MoS2/ZnIn2S4 (ut-MoS2/ZIS) were designed and prepared via two steps of the in situ hydro/solvothermal method. Benefiting from the ultrathin structure and the large and intimate contact between ut-ZIS and MoS2, the charge transfer was increased and the recombination of photogenerated carriers was suppressed. It is also noteworthy that 4 wt % ut-MoS2/ZIS gave the highest hydrogen evolution rate of 221.71 μmol h–1under visible light irradiation (λ > 420 nm), and the apparent quantum yield was measured to be 11.8% at 420 nm. Meanwhile, ut-MoS2/ZIS showed high stability after 16 h of irradiation. PL, TRPL spectrum, and photoelectrochemical measurement demonstrated that MoS2 cocatalyst playeds a vitally important role in the separation of charge carriers and proton reduction reaction. This work is expected to inspire the design and development of highly efficient ultrathin photocatalysts.