An atomic-level charge transfer channels constructed with special Co-S bond and P-S bond in ZnCdS/CoSP S-scheme heterojunction for hydrogen evolution

Abstract

Accelerating the electron transport efficiency is the key to improving photocatalytic performance. In this work, a hydrothermal strategy was developed to anchor the granular ZnCdS onto amorphous CoSP and form the S-scheme heterojunction photocatalyst ZnCdS/CoSP with the formation of special S-P and Co-S bonds to improve the hydrogen production performance and stability of photocatalysts. The results show that the hydrothermally synthesized materials have 193, 8.2 and 1.13 times higher photocatalytic hydrogen production rates than those of CoSP, ZnCdS and physically synthesized ZnCdS/CoSP, respectively. The ZnCdS/CoSP photocatalysts have been demonstrated by X-ray photoelectron spectroscopy, hydrogen production experiments and some other characterizations that the S-scheme heterojunction constructed by ZnCdS/CoSP can improve the interfacial interaction of ZnCdS-CoSP. The S-P bond and Co-S bond constructed by both posses penetrating electron channels, which can effectively promote the interfacial charge transfer. The strategies of constructing S-scheme heterojunctions and S-P bonds and Co-S bonds provide new ideas for improving the separation efficiency of photogenerated carriers and optimizing the interfacial engineering photocatalyst projects.