Accelerating charge transfer for highly efficient visible-light-driven photocatalytic H2 production: In-situ constructing Schottky junction via anchoring Ni-P alloy onto defect-rich ZnS

Abstract

The development of efficient and stable photocatalysts is fundamentally required for sunlight-driven water splitting. Herein, Ni-P alloy is controllably anchored onto the surface of defect-rich ZnS (DR-ZnS) nanospheres through in-situ photodeposition strategy. The optimized Ni-P/DR-ZnS nanocomposite displays superior visible-light photocatalytic H2 production rate (69.92 μmol h−1), which is about 29 times and 3.6 times higher than that of the bare DR-ZnS and 1 wt% Pt/DR-ZnS, respectively, and a notable apparent quantum yield of 2.4 % at 420 nm. The existence of rich defects endows the DR-ZnS with visible-light absorption capability. The constructed Schottky junction between the Ni-P alloy and DR-ZnS accelerates the transfer of photogenerated electrons from DR-ZnS to Ni-P, thus boosting the photocatalytic performance. Moreover, the charge transfer process and underlying photocatalytic mechanism are unravelled by multiple in-depth characterizations. This research sheds novel light on rationally fabricating high-efficient and low-cost photocatalysts through integrating defect engineering and Schottky junction design.