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Au LSPR Effect Enhanced R-CeO2/G-C3N4 S-scheme Heterojunction for Accelerating CO2 Photoreduction Performance.

Xin Li1,2, Yongsheng Hu1, Peng Tian1

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Small (Weinheim an Der Bergstrasse, Germany)
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Summary
This summary is machine-generated.

This study introduces a novel R-CeO2/Au/g-C3N4 S-scheme heterojunction photocatalyst (CAC-2) for efficient carbon dioxide (CO2) photoreduction. The composite demonstrates significantly enhanced CO2 adsorption and conversion to CO, attributed to the synergistic effects of gold nanoparticles and the S-scheme heterojunction.

Keywords:
CO2 photoreductionCeO2LSPRS‐schemeg‐C3N4

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Area of Science:

  • Materials Science
  • Photocatalysis
  • Environmental Chemistry

Background:

  • Efficient CO2 photoreduction requires excellent CO2 adsorption and rapid photogenerated carrier supply.
  • Developing advanced photocatalysts is crucial for addressing climate change and energy demands.

Purpose of the Study:

  • To design and synthesize a novel R-CeO2/g-C3N4 S-scheme heterojunction photocatalyst enhanced with gold nanoparticles (Au NPs) for improved CO2 photoreduction.
  • To investigate the synergistic effects of Au localized surface plasmon resonance (LSPR) and the S-scheme heterojunction on CO2 conversion efficiency.

Main Methods:

  • Fabrication of the R-CeO2/Au/g-C3N4 (CAC-2) ternary composite photocatalyst.
  • Characterization of photocatalytic activity for CO2 reduction to CO under UV-vis irradiation.
  • Utilized FDTD simulation, DFT calculation, photoelectrochemical tests, N2/CO2 adsorption-desorption, in situ FTIR, in situ ESR, and 13C isotope tracer experiments to elucidate the mechanism.

Main Results:

  • The CAC-2 photocatalyst exhibited a CO yield of 50.58 µmol·g−1·h−1, significantly outperforming pristine R-CeO2 and g-C3N4.
  • Au NPs introduction enhanced photogenerated carrier separation and reduced the *COOH intermediate formation energy barrier.
  • The ternary composite showed superior CO2 adsorption capacity and electron density at reduction sites, boosting catalytic activity.
  • A synergistic enhancement mechanism involving Au LSPR and the S-scheme heterojunction was proposed.

Conclusions:

  • The Au-enhanced R-CeO2/g-C3N4 S-scheme heterojunction (CAC-2) demonstrates superior performance and stability for CO2 photoreduction.
  • The study provides a mechanistic understanding of how LSPR and S-scheme heterojunctions synergistically improve photocatalytic CO2 conversion.
  • This work offers a promising strategy for developing advanced photocatalysts for CO2 utilization.