Interfacial Charge Regulation in Solid-State UiO-67/ZnIn2S4/Pt Z-Scheme Heterojunctions for Efficient Photocatalytic Hydrogen Evolution

Abstract

ZnIn2S4 (ZIS) is a promising visible-light photocatalyst, yet its activity and stability are severely limited by rapid charge recombination and photocorrosion. Here we report a UiO-67-mediated solid-state Z-scheme strategy to simultaneously enhance the efficiency and durability of ZIS for photocatalytic hydrogen evolution. By integrating UiO-67 with ZIS and Pt nanoparticles, an intimate heterointerface with pronounced interfacial charge redistribution is established, featuring spontaneous electron transfer from UiO-67 to ZIS. As a result, the UiO-67/ZIS/Pt composite delivers a hydrogen evolution rate 15.69 times higher than pristine ZIS, together with an apparent quantum yield of 5.94% at 380 nm and excellent cycling stability. Mechanistic studies reveal that UiO-67 functions as an interfacial charge-regulation platform that promotes Z-scheme electron flow while suppressing charge recombination. This work provides a rational approach for overcoming the intrinsic limitations of metal sulfide photocatalysts via MOF-mediated Z-scheme engineering.