CoV-LDH-Derived CoP2 Active Sites and ZnxCd1-xS Solid-Solution Ingeniously Constructed S-Scheme Heterojunction for Photocatalytic Hydrogen Evolution

Establishing efficient charge-transfer channels that provide sufficient active sites to enhance the activity of photocatalysts remains a challenging problem. In this work, n-type CoP2 semiconductors as one of the main active components for efficient hydrogen evolution are obtained from bulk P-CoV-LDH. The emergence of CoP2 semiconductors not only enriches the active sites but also carries a large amount of negatively charged P, which can act as a base to seize more protons, thereby accelerating the precipitation of hydrogen. To achieve oriented control of carrier migration, the ZnxCd1-xS solid solution is effectively combined with P-CoV-LDH for the first time to synthesize a highly efficient and stable S-scheme heterojunction photocatalyst. The best P-CoV-LDH/ZnxCd1-xS 30% composite has a hydrogen evolution rate of 1244.3 mu mol without noble metal additives, which is 6.4 times more than ZnxCd1-xS. S-scheme heterojunctions exhibit remarkable photocarrier separation efficiency and low interfacial migration resistance.

Automated summary

This study presents a highly efficient and stable photocatalyst for hydrogen evolution by using CoP2 semiconductors and P-CoV-LDH. The introduction of ZnxCd1-xS solid solution enables the oriented control of carrier migration and enhances the efficiency of the photocatalyst.