Yuejiao An , Wenxuan Liu , Yanfeng Zhang , Jianjun Zhang , Zhansheng Lu
{"title":"SnO2/BiOBr S-Scheme异质结构光致电荷转移机理研究","authors":"Yuejiao An , Wenxuan Liu , Yanfeng Zhang , Jianjun Zhang , Zhansheng Lu","doi":"10.3866/PKU.WHXB202407021","DOIUrl":null,"url":null,"abstract":"<div><div>S-scheme heterojunctions can preserve strong redox capacity on the basis of achieving spatial separation of photogenerated carriers. Therefore, a deep comprehension of the photoinduced charge transfer dynamics in S-scheme heterostructures is vital to enhancing photocatalytic properties. Herein, SnO<sub>2</sub>/BiOBr S-scheme heterojunctions with tight contact are fabricated with <em>in situ</em> hydrothermal method. The optimal SnO<sub>2</sub>/BiOBr exhibits excellent photocatalytic performance for CO<sub>2</sub> reduction, with yields of CO and CH<sub>4</sub> of 345.7 and 6.7 μmol∙g<sup>–1</sup>∙h<sup>–1</sup>, which are 5.6 and 3.7 times higher than those of the original BiOBr. The photoinduced charge transfer mechanism and dynamics of SnO<sub>2</sub>/BiOBr S-scheme heterostructure are characterized by <em>in situ</em> X-ray photoelectron spectrum (XPS) and femtosecond transient absorption spectroscopy (fs-TA). A new fitted lifetime of photogenerated carriers are observed, which could be attributed to interfacial electron transfer of S-scheme heterojunction, further illustrating an ultrafast transfer channel for photoelectrons from SnO<sub>2</sub> conduction band to BiOBr valence band. As a result, the powerful reduced electrons in BiOBr conduction band and the powerful oxidation holes in SnO<sub>2</sub> valence band are retained. This work provides profound comprehension of photoinduced charge transfer mechanism of S-scheme heterojunction.</div><div><span><figure><span><img><ol><li><span><span>Download: <span>Download high-res image (85KB)</span></span></span></li><li><span><span>Download: <span>Download full-size image</span></span></span></li></ol></span></figure></span></div></div>","PeriodicalId":6964,"journal":{"name":"物理化学学报","volume":"40 12","pages":"Article 2407021"},"PeriodicalIF":10.8000,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Revealing Photoinduced Charge Transfer Mechanism of SnO2/BiOBr S-Scheme Heterostructure for CO2 Photoreduction\",\"authors\":\"Yuejiao An , Wenxuan Liu , Yanfeng Zhang , Jianjun Zhang , Zhansheng Lu\",\"doi\":\"10.3866/PKU.WHXB202407021\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>S-scheme heterojunctions can preserve strong redox capacity on the basis of achieving spatial separation of photogenerated carriers. Therefore, a deep comprehension of the photoinduced charge transfer dynamics in S-scheme heterostructures is vital to enhancing photocatalytic properties. Herein, SnO<sub>2</sub>/BiOBr S-scheme heterojunctions with tight contact are fabricated with <em>in situ</em> hydrothermal method. The optimal SnO<sub>2</sub>/BiOBr exhibits excellent photocatalytic performance for CO<sub>2</sub> reduction, with yields of CO and CH<sub>4</sub> of 345.7 and 6.7 μmol∙g<sup>–1</sup>∙h<sup>–1</sup>, which are 5.6 and 3.7 times higher than those of the original BiOBr. The photoinduced charge transfer mechanism and dynamics of SnO<sub>2</sub>/BiOBr S-scheme heterostructure are characterized by <em>in situ</em> X-ray photoelectron spectrum (XPS) and femtosecond transient absorption spectroscopy (fs-TA). A new fitted lifetime of photogenerated carriers are observed, which could be attributed to interfacial electron transfer of S-scheme heterojunction, further illustrating an ultrafast transfer channel for photoelectrons from SnO<sub>2</sub> conduction band to BiOBr valence band. As a result, the powerful reduced electrons in BiOBr conduction band and the powerful oxidation holes in SnO<sub>2</sub> valence band are retained. This work provides profound comprehension of photoinduced charge transfer mechanism of S-scheme heterojunction.</div><div><span><figure><span><img><ol><li><span><span>Download: <span>Download high-res image (85KB)</span></span></span></li><li><span><span>Download: <span>Download full-size image</span></span></span></li></ol></span></figure></span></div></div>\",\"PeriodicalId\":6964,\"journal\":{\"name\":\"物理化学学报\",\"volume\":\"40 12\",\"pages\":\"Article 2407021\"},\"PeriodicalIF\":10.8000,\"publicationDate\":\"2024-12-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"物理化学学报\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1000681824001863\",\"RegionNum\":2,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"物理化学学报","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1000681824001863","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Revealing Photoinduced Charge Transfer Mechanism of SnO2/BiOBr S-Scheme Heterostructure for CO2 Photoreduction
S-scheme heterojunctions can preserve strong redox capacity on the basis of achieving spatial separation of photogenerated carriers. Therefore, a deep comprehension of the photoinduced charge transfer dynamics in S-scheme heterostructures is vital to enhancing photocatalytic properties. Herein, SnO2/BiOBr S-scheme heterojunctions with tight contact are fabricated with in situ hydrothermal method. The optimal SnO2/BiOBr exhibits excellent photocatalytic performance for CO2 reduction, with yields of CO and CH4 of 345.7 and 6.7 μmol∙g–1∙h–1, which are 5.6 and 3.7 times higher than those of the original BiOBr. The photoinduced charge transfer mechanism and dynamics of SnO2/BiOBr S-scheme heterostructure are characterized by in situ X-ray photoelectron spectrum (XPS) and femtosecond transient absorption spectroscopy (fs-TA). A new fitted lifetime of photogenerated carriers are observed, which could be attributed to interfacial electron transfer of S-scheme heterojunction, further illustrating an ultrafast transfer channel for photoelectrons from SnO2 conduction band to BiOBr valence band. As a result, the powerful reduced electrons in BiOBr conduction band and the powerful oxidation holes in SnO2 valence band are retained. This work provides profound comprehension of photoinduced charge transfer mechanism of S-scheme heterojunction.
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