Unique Sillen-structured multimetal high entropy oxyhalide PbxCd1-xBiO2Br with enhanced photocatalytic activity

Based on the typical Sillen-structured bimetallic oxyhalide layered structure, the introduction of the crystal structure of a high entropy semiconductor photocatalyst allowed the formation of a novel Sillen-structured multimetal high entropy oxyhalide materials with metal cooperativity. A Sillen-structured multimetal high entropy oxyhalide PbxCd1-xBiO2Br material was designed, possessing both ultrathin layered structure of Sillen-structured metal oxyhalides and typical advantages of high stability and more active sites for high entropy alloys. The transfer path of photogenerated electrons is narrowed, and their migration and separation are significantly improved. The catalytic activity was investigated through the photocatalytic degradation of organic pollutants. As verified by ESR and radical trapping experiments, hole (h(+)) and superoxide radical (O-center dot(2)-) were proved to be the principal active species during photocatalysis. In this paper, we propose a scheme to combine a high entropy alloy with a Sillen-structured bimetallic oxyhalide and successfully construct a Sillen-structured multimetallic high entropy oxyhalide PbxCd1-xBiO2Br material, which will provide a new direction for the development of Sillen-structured bismuth-based systems.

Automated summary

This study successfully designed a novel Sillen-structured multimetal high entropy oxyhalide material, which combines the benefits of high stability and more active sites with improved migration and separation of photogenerated electrons, showing promising catalytic activity for organic pollutants degradation.