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Oxygen vacancy mediated construction of anatase/brookite heterophase junctions for high-efficiency photocatalytic hydrogen evolution

Abstract

In the past several years, exploration of non-stoichiometric metal oxides has triggered an explosion of interest for many important applications, while the contribution of oxygen vacancy defects to the photocatalytic performance of surface heterophase junctions is still an open question. In this paper, a hydrogenation treatment method was used to fabricate defect-rich heterophase junctions. Experimental characterizations indicated that the generation of oxygen vacancies not only influenced the electronic structure of TiO2 nanofibers, but also facilitated the phase transformation from anatase/rutile to anatase/brookite junctions. For the improved interfacial charge separation, a novel urea-assited strategy was further developed to achieve the subsequent rearrangement of oxygen vacancy defects. As a result, ESR and XPS measurements evidenced the diminishment of bulk defects and the preservation of surface oxygen vacancies. Anatase/brookite heterophase junctions with surface oxygen vacancies exhibited an unpredictable hydrogen production rate of 1.6 mmol/h, which was more than 12 times higher than pristine TiO2 nanofibers. Our work revealed the significant impact of oxygen vacancies on the phase and electronic structures of heterophase junction. It also provided an effective strategy to develop highly active TiO2-based photocatalysts through integrating defect modulation and junction design.

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Publication details

The article was received on 06 Oct 2017, accepted on 10 Nov 2017 and first published on 10 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA08809D
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Oxygen vacancy mediated construction of anatase/brookite heterophase junctions for high-efficiency photocatalytic hydrogen evolution

    X. An, C. Hu, H. Liu and J. Qu, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08809D

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