Revealing Photoinduced Charge Transfer Mechanism of SnO2/BiOBr S-Scheme Heterostructure for CO2 Photoreduction

被引:0
|
作者
An, Yuejiao [1 ]
Liu, Wenxuan [2 ]
Zhang, Yanfeng [1 ]
Zhang, Jianjun [3 ]
Lu, Zhansheng [2 ,4 ]
机构
[1] Hebei Normal Univ, Coll Chem & Mat Sci, Natl Demonstrat Ctr Expt Chem Educ, Hebei Key Lab Inorgan Nanomat, Shijiazhuang 050024, Peoples R China
[2] Henan Normal Univ, Sch Phys, Henan Key Lab Adv Semicond & Funct Device Integrat, Xinxiang 453007, Henan, Peoples R China
[3] China Univ Geosci, Fac Mat Sci & Chem, Lab Solar Fuel, Wuhan 430078, Peoples R China
[4] Beijing Univ Chem Technol, Sch Math & Phys, Beijing 100029, Peoples R China
基金
中国国家自然科学基金;
关键词
SnO2/BiOBr; CO2; photoreduction; S-scheme heterojunction; fs-TA; in situ XPS; PHOTOCATALYSTS; BR;
D O I
10.3866/PKU.WHXB202407021
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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 mu mol 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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页数:11
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