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

Abstract

AbstractEstablishing 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 µmol 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.