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New insights into interfacial photocharge transfer in TiO2/C3N4 heterostructures: effects of facet and defect

Abstract

Much efforts are being pursued in hybridizing TiO2 photocatalysts with graphene-analogue g-C3N4. However, a fundamental understanding on the interfacial behavior of charge carriers is still lacking. In this paper, the impact of exposed facets and structural defects on the charge transfer mechanism around heterostructured interfaces was investigated. Due to the electron-rich feature and the relatively lower CB position, integrating g-C3N4 with 101-TiO2 facilitated the Z-scheme recombination of electrons in the CB of 101-TiO2 and holes in the VB of g-C3N4. Creating oxygen vacancies in TiO2 resulted in the 4- and 24-fold increased photoactivity than blank TiO2 and g-C3N4. Differently, 001-facets of TiO2 were prone to accept electrons from the CB of g-C3N4, forming the conventional Type II junction with poor photoreduction ability. For 001-TiO2/g-C3N4 heterojunctions, nitrogen vacancies in g-C3N4 presented more important role in separating charge carriers. Our discovery provides an efficient way to design high-performance TiO2-based heterostructured photocatalysts through facet and defect engineering.

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Publication details

The article was received on 02 Jan 2019, accepted on 12 Feb 2019 and first published on 13 Feb 2019


Article type: Paper
DOI: 10.1039/C9NJ00027E
Citation: New J. Chem., 2019, Accepted Manuscript

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    New insights into interfacial photocharge transfer in TiO2/C3N4 heterostructures: effects of facet and defect

    Y. Wu, L. Liu, X. An and T. Wei, New J. Chem., 2019, Accepted Manuscript , DOI: 10.1039/C9NJ00027E

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