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

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.

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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).

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Correspondence to Siang-Piao Chai.

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

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Kong, X.Y., Tan, W.L., Ng, BJ. et al. Harnessing Vis–NIR broad spectrum for photocatalytic CO2 reduction over carbon quantum dots-decorated ultrathin Bi2WO6 nanosheets. Nano Res. 10, 1720–1731 (2017). https://doi.org/10.1007/s12274-017-1435-4

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Keywords

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