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Band structure engineering of boron–oxygen-based materials for efficient charge separation

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Abstract

Efficient charge separation and suitable band alignment are critical for developing excellent photocatalysts. Boron–oxygen-based materials have been proven to be significant semiconductor photocatalysts to solve the energy crisis. Our results suggested that the separation of photogenerated carriers can be promoted by tuning the band gap of the materials from indirect to direct by the substitution of cations. Almost 87.8% and 71.5% of the total chloride contents were converted to Cl anions after 20 minutes of UV-Vis light illumination for the indirect-band-gap material KBBO and the direct-band-gap material NBBO for 2,4-DCP degradation, respectively. The dechlorination efficiency of KBBO was approximately 5.3 times that of the commercial P25 TiO2 catalyst. The increased activity could be ascribed to the different locations of the photoinduced charges, making the charges have a long-term effect on the contaminants. By the KPFM method, we concluded that the materials with larger surface potential changes would behave higher photocatalytic activity. This contribution can provide a new approach to optimize the boron–oxygen-based materials for designing efficient photocatalysts.

Graphical abstract: Band structure engineering of boron–oxygen-based materials for efficient charge separation

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Publication details

The article was received on 01 Feb 2019, accepted on 29 Apr 2019 and first published on 06 May 2019


Article type: Research Article
DOI: 10.1039/C9QM00072K
Mater. Chem. Front., 2019, Advance Article

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    Band structure engineering of boron–oxygen-based materials for efficient charge separation

    X. Fan, K. Zhong, Y. Zhang, J. Yin and Y. Zhai, Mater. Chem. Front., 2019, Advance Article , DOI: 10.1039/C9QM00072K

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