CoV‐LDH‐Derived CoP<sub>2</sub> Active Sites and Zn<i><sub>x</sub></i>Cd<sub>1−</sub><i><sub>x</sub></i>S Solid‐Solution Ingeniously Constructed S‐Scheme Heterojunction for Photocatalytic Hydrogen Evolution
Xin Guo, Cancan Chang, Guorong Wang, Xuqiang Hao, Zhiliang Jin
Abstract
Abstract 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 CoP 2 semiconductors as one of the main active components for efficient hydrogen evolution are obtained from bulk P‐CoV‐LDH. The emergence of CoP 2 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 Zn x Cd 1− x S 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/Zn x Cd 1− x S 30% composite has a hydrogen evolution rate of 1244.3 µmol without noble metal additives, which is 6.4 times more than Zn x Cd 1− x S. S‐scheme heterojunctions exhibit remarkable photocarrier separation efficiency and low interfacial migration resistance.