Rational Design of a Novel S-Scheme Heterojunction based on ZIF-67-Supported Ni-Fe Layered Double Hydroxide for Efficient Photocatalytic Hydrogen Generation

Benefiting from the rich variety of structure and superior performance, metal–organic framework (MOF) materials and layered double hydroxides (LDHs) have attracted much attention in the field of photocatalytic hydrogen evolution. However, as it is difficult to meet the requirements of efficient charge separation with a single material, heterojunction design is usually an effective strategy to construct efficient photocatalysts. In this work, a ZIF-67@Ni-Fe LDH S-scheme heterojunction photocatalyst was successfully prepared by the in situ-driven growth of Ni-Fe LDH on ZIF-67. The unique dodecahedron structure of ZIF-67 provides sufficient dispersion space for Ni-Fe LDH and effectively prevents the agglomeration of Ni-Fe LDH. Through photoluminescence spectroscopy and electrochemical experiments, the efficient utilization of photogenerated electrons in ZIF-67@Ni-Fe LDH was strongly confirmed. This study provides a feasible path for the preparation of highly efficient photocatalysts.