Amorphous W‐S‐P Modified ZnxCd1−xS with Tunable Band Structure for Efficient Photocatalytic Overall Water Splitting

The photocatalytic overall water splitting performance of the bandgap controllable Zn x Cd 1− x S solid solution is still restricted by its photo‐corrosion. In this study, amorphous tungsten phosphosulphide (W‐S‐P) modified Zn x Cd 1− x S solid solution is successfully prepared as a visible‐light‐driven photocatalyst and an efficient and stable Zn x Cd 1− x S/W‐S‐P heterojunction is constructed through intimate W‐S covalent bonds for efficient photocatalytic overall water splitting. The hydrogen evolution rate of the composite catalyst reached 18899.6 μmol g −1 h −1 , which is 86 times and 5 times higher than that of W‐S‐P and Zn 0.5 Cd 0.5 S, respectively. At this time, the precipitation rates of H 2 and O 2 were 157.07 μmol g −1 h −1 and 78.05 μmol g −1 h −1 without any noble metal catalyst. In this work, the overall water splitting efficiency of the catalyst is greatly improved by constructing a Zn x Cd 1− x S/W‐S‐P Schottky heterojunction, which further inhibits the photo‐corrosion of the Zn x Cd 1− x S catalyst. At the same time, the strong internal electric field greatly improves the charge transfer efficiency. It provides a new idea for an in‐depth understanding of the chemical changes of elemental binding energy in Zn x Cd 1− x S solid solution and the design of new binary photocatalytic materials.