In SituGrowth of ZnIn2S4on MOF-Derived Ni–Fe LDH to Construct Ternary-Shelled Nanotubes for Efficient Photocatalytic Hydrogen Evolution

A rational design of a novel ternary-shelled nanotube is attractive in photocatalytic water splitting. Herein, ZnIn2S4nanosheets were in situgrown on the surface of MIL-88A-derived Ni–Fe layered double hydroxide (LDH) to fabricate ternary-shelled nanotubes (ZIS@Ni–Fe LDH) viaa self-assembly strategy. Characterization indicates that the ZIS@Ni–Fe LDH heterostructure exhibits a high surface area and a well-defined ternary-shelled hollow structure. The optimal heterostructure presents a remarkably improved photocatalytic hydrogen production rate (2035.81 μmol g–1h–1) compared with bare ZnIn2S4and MIL-88A-derived Ni–Fe LDH under visible light illumination. The effect of ZnIn2S4loading on the photocatalytic performance and stability of ZIS@Ni–Fe LDH is systematically studied. The ZIS@Ni–Fe LDH heterostructure can make better use of the inner space, provide abundant reactive sites, improve light harvesting, accelerate interfacial electron transfer, and further promote photocatalytic hydrogen evolution. Based on the electrocatalytic performance, the probable photocatalytic mechanism and the electron transfer pathway can be proposed. Our work provides a facile and efficient strategy to construct ternary-shelled heterojunction photocatalysts.