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Dimension-matched plasmonic Au/TiO2/BiVO4 nanocomposites as efficient wide-visible-light photocatalysts to convert CO2 and mechanism insights

Abstract

Dimension (D)-matched plasmonic Au/TiO2/BiVO4 nanocomposites have been successfully constructed by firstly preparing BiVO4 nanoflakes via an ion exchange process from BiOCl nanosheets, followed by coupling (001) facet-exposed anatase TiO2 nanosheets and then modifying plasmonic Au nanorods. The well-designed 1D/2D/2D nanocomposites exhibit exceptional visible-light photocatalytic activities for CO2 conversion, by ~30-fold and ~60-fold enhancement compared to the resulting BiVO4 nanoflakes and the previously-reported BiVO4 nanoparticles, respectively. Based on the steady-state surface photovoltage spectra, transient-state surface photovoltage responses, wavelength-dependent photocurrent action spectra and fluorescence spectra related to the produced •OH amounts, it is confirmed that the exceptional photocatalytic activity is comprehensively attributed to the fabricated 2D nanoflakes to increase the specific surface area of BiVO4, to the coupled TiO2 nanosheets as a new proper-energy platform to accept photogenerated electrons from BiVO4 and plasmonic Au so as to greatly enhance the charge separation, and to the modified plasmonic Au with the extended wide-visible-light absorption to 660 nm to take as the co-catalyst for the transferred electrons to induce reduction reactions. Moreover, the dimension matching in the fabricated nanocomposite is much favorable for the photogenerated charge transfer and separation. Furthermore, it is suggested by isotope experiments of 13CO2 and D2O, along with electrochemical measurements, the produced H atoms are dominant active radicals to initiate the conversion of CO2.

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Publication details

The article was received on 29 Mar 2018, accepted on 16 May 2018 and first published on 17 May 2018


Article type: Paper
DOI: 10.1039/C8TA02889C
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Dimension-matched plasmonic Au/TiO2/BiVO4 nanocomposites as efficient wide-visible-light photocatalysts to convert CO2 and mechanism insights

    J. Bian, Y. Qu, X. Zhang, N. Sun, D. Tang and L. Jing, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA02889C

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