p-BiOI/n-SnS2 heterojunction flowerlike structure with enhanced visible-light photocatalytic performance

摘要

A BiOI/SnS2 p-n junction is prepared by depositing BiOI particles on flowerlike SnS2 flakes. The heterojunction formed between p-type BiOI and n-type SnS2 brings greatly improved photocatalytic activity compared with pure SnS2 or BiOI in the degradation of Rhodamine B dye under visible light and sunlight irradiation. The improved photocatalytic performance is explained by the synergetic effects of the formation of a p-n junction between BiOI and SnS2. The migration of photogenerated carriers can be promoted by the electric field established at the heterojunction interfaces, leading to effective separation of the photogenerated electron-hole pairs and reduced electron-hole recombination. The BiOI/SnS2 heterojunction will find promising applications in photocatalysis and solar energy conversion.