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Issue 21, 2017
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Efficient hydrogen evolution under visible light irradiation over BiVO4 quantum dot decorated screw-like SnO2 nanostructures

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Abstract

Nanostructured photocatalysts are often attractive due to their enhanced photocatalytic performance by the quantization effect. In this study, BiVO4 quantum dots were decorated on the surface of screw-like SnO2 nanostructures by successive ionic layer absorption and reaction method. The distinctions from bulk materials and the role of BiVO4 quantum dots were investigated in their function as a water splitting photoanode. It was demonstrated that the band-gap of BiVO4 could increase to 2.6 eV when the particle size decreased to about 5 nm, but the band gap of the bulk was only 2.4 eV. Moreover, the decrease in particle size and the coupling with screw-like SnO2 nanostructures enhanced the photocurrent density up to two times under visible light irradiation. The incident photon to current conversion efficiency also increased up to 13.47% at 400 nm. Furthermore, by depositing Pt as cocatalyst, splitting water into hydrogen was realized on the BiVO4 quantum dot/screw-like SnO2 nanostructures under visible light irradiation, and the generation rate is up to 1.16 μmol h−1 cm−2. The improved photoelectrochemical properties and the enhanced photocatalytic activity for hydrogen evolution are attributed to the effective electron-transfer between BiVO4 quantum dots and screw-like SnO2 nanostructures, and the accordingly prolonged photogenerated charge carrier lifetime, as well as the elevated conduction band bottom level of BiVO4 and SnO2 due to the band-gap widening and energy level realignment.

Graphical abstract: Efficient hydrogen evolution under visible light irradiation over BiVO4 quantum dot decorated screw-like SnO2 nanostructures

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Publication details

The article was received on 15 Feb 2017, accepted on 27 Apr 2017 and first published on 27 Apr 2017


Article type: Paper
DOI: 10.1039/C7TA01415E
Citation: J. Mater. Chem. A, 2017,5, 10338-10346
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    Efficient hydrogen evolution under visible light irradiation over BiVO4 quantum dot decorated screw-like SnO2 nanostructures

    M. Xie, Z. Zhang, W. Han, X. Cheng, X. Li and E. Xie, J. Mater. Chem. A, 2017, 5, 10338
    DOI: 10.1039/C7TA01415E

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