Jump to main content
Jump to site search

Issue 25, 2018
Previous Article Next Article

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

Author affiliations

Abstract

Dimension (D)-matched plasmonic Au/TiO2/BiVO4 nanocomposites have been successfully constructed by first 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, and these nanocomposites indicate ∼30-fold and ∼60-fold enhancements compared to the resulting BiVO4 nanoflakes and the previously-reported BiVO4 nanoparticles, respectively. Based on steady-state surface photovoltage spectroscopy, transient-state surface photovoltage responses, wavelength-dependent photocurrent action spectra and fluorescence spectra related to the amount of produced ˙OH species, it is confirmed that the exceptional photocatalytic activity can be comprehensively ascribed to the following phenomena which result from the fabrication of 2D nanoflakes: increased specific surface area of BiVO4, coupling of TiO2 nanosheets to form a new proper-energy platform, which can accept photogenerated electrons from BiVO4 and plasmonic Au so as to greatly enhance the charge separation, and modified plasmonic Au with the extended wide-visible-light absorption to 660 nm, which can act as the co-catalyst for the transferred electrons to induce reduction reactions. Moreover, dimension matching in the fabricated nanocomposite is very favorable for photogenerated charge transfer and separation. Furthermore, isotope experiments of 13CO2 and D2O along with electrochemical measurements suggest that the produced H atoms are dominant active radicals, which can initiate the conversion of CO2.

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

Back to tab navigation

Supplementary files

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, 2018,6, 11838-11845
  •   Request permissions

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

    J. Bian, Y. Qu, X. Zhang, N. Sun, D. Tang and L. Jing, J. Mater. Chem. A, 2018, 6, 11838
    DOI: 10.1039/C8TA02889C

Search articles by author

Spotlight

Advertisements