Qiang Wang, Li Li, Rongrong Liu, Ping Wang, Yapeng Wang, Jun Liang
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引用次数: 0
Abstract
The ability to generate heterostructures with a desirable charge transfer pathway is essential for achieving semiconductor photocatalysts with super photocatalytic activity. Herein, it is proposed to realize robust tailoring of effective charge transfer pathway in semiconductor-based heterostructures via work function regulation, and elucidate the influence of the work function of the semiconductor on the charge transfer mechanism at the heterostructure interface. Specifically, taking type-II heterostructure SrTiO3/Mn3O4 as an example, introducing BiFeO3 into SrTiO3 effectively regulate the work function of the (BiFeO3)x(SrTiO3)1−x/Mn3O4 (BxT1−x/Mn3O4) solid solution through optimizing the x value. Combined with in situ testing, the results show that the original type-II heterojunction SrTiO3/Mn3O4 is converted into S-scheme heterojunction (BiFeO3)0.3(SrTiO3)0.7/Mn3O4 when BiFeO3 is introduced. This increases the work function of the semiconductor, inducing the light-generated carriers to be guided and separated by the generated built-in electric field. Therefore, the implementation of this strategy can achieve efficient photocatalytic CO2 reduction. In contrast to pristine SrTiO3/Mn3O4, the (BiFeO3)0.3(SrTiO3)0.7/Mn3O4 heterostructure exhibits a 28-fold enhancement of in electron consumption rate during photocatalytic CO2 reduction, and the reaction mechanism is suggested. In this study, a strategy for effectively converting interfacial charge transfer pathways in semiconductor photocatalysts is developed to enhance the photoconversion kinetics of CO2 and H2O.
期刊介绍:
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