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Nano Research

, Volume 10, Issue 5, pp 1720–1731 | Cite as

Harnessing Vis–NIR broad spectrum for photocatalytic CO2 reduction over carbon quantum dots-decorated ultrathin Bi2WO6 nanosheets

  • Xin Ying Kong
  • Wen Liang Tan
  • Boon-Junn Ng
  • Siang-Piao ChaiEmail author
  • Abdul Rahman Mohamed
Research Article

Abstract

The photocatalytic reduction of CO2 to energy-rich hydrocarbon fuels is a promising and sustainable method of addressing global warming and the imminent energy crisis concomitantly. However, a vast majority of the existing photocatalysts are only capable of harnessing ultraviolet (UV) or/and visible light (Vis), whereas the near-infrared (NIR) region still remains unexplored. In this study, carbon quantum dots (CQDs)-decorated ultrathin Bi2WO6 nanosheets (UBW) were demonstrated to be an efficient photocatalyst for CO2 photoreduction over the Vis–NIR broad spectrum. It is noteworthy that the synthesis procedure of the CQDs/UBW hybrid nanocomposites was highly facile, involving a one-pot hexadecyltrimethylammonium bromide (CTAB)-assisted hydrothermal process. Under visible light irradiation, the optimized 1CQDs/UBW (1 wt.% CQD content) exhibited a remarkable 9.5-fold and 3.1-fold enhancement of CH4 production over pristine Bi2WO6 nanoplatelets (PBW) and bare UBW, respectively. More importantly, the photocatalytic responsiveness of CQDs/UBW was successfully extended to the NIR region, which was achieved without involving any rare earth or noble metals. The realization of NIR-driven CO2 reduction could be attributed to the synergistic effects of (i) the ultrathin nanostructures and highly exposed {001} active facets of UBW, (ii) the excellent spectral coupling of UBW and CQDs, where UBW could be excited by the up-converted photoluminescence of CQDs, and (iii) the electron-withdrawing nature of the CQDs to trap the photogenerated electrons and retard the recombination of charge carriers.

Keywords

photocatalysis CO2 reduction near-infrared (NIR) light carbon quantum dots bismuth tungstate ultrathin nanosheets 

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Notes

Acknowledgements

The work was funded by the Ministry of Higher Education (MOHE) Malaysia and Universiti Sains Malaysia (USM) under NanoMITe Long-term Research Grant Scheme (LRGS) (No. 203/PJKIMIA/6720009).

Supplementary material

12274_2017_1435_MOESM1_ESM.pdf (1.5 mb)
Harnessing Vis–NIR broad spectrum for photocatalytic CO2 reduction over carbon quantum dots-decorated ultrathin Bi2WO6 nanosheets

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Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Xin Ying Kong
    • 1
  • Wen Liang Tan
    • 1
  • Boon-Junn Ng
    • 1
  • Siang-Piao Chai
    • 1
    Email author
  • Abdul Rahman Mohamed
    • 2
  1. 1.Multidisciplinary Platform of Advanced Engineering, Chemical Engineering Discipline, School of EngineeringMonash University, Jalan Lagoon SelatanBandar SunwayMalaysia
  2. 2.Low Carbon Economy (LCE) Group, School of Chemical Engineering, Engineering CampusUniversiti Sains Malaysia, Seri AmpanganNibong TebalMalaysia

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