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Strain-Engineering of Mesoporous Cs Bi Br /BiVO S-Scheme Heterojunction for Efficient CO Photoreduction. | LitMetric

Strain-Engineering of Mesoporous Cs Bi Br /BiVO S-Scheme Heterojunction for Efficient CO Photoreduction.

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School of Environment and Energy, State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, South China University of Technology, Guangzhou, 510000, China.

Published: July 2023

AI Article Synopsis

  • Slow charge kinetics and poor CO adsorption hinder CO photoreduction; this study introduces a novel strain-engineered Cs Bi Br /hierarchically porous BiVO heterojunction to overcome these issues.
  • Density functional theory indicates that tensile strain in Cs Bi Br lowers the energy levels of actively involved Bi atoms, enhancing the process of CO adsorption and activation.
  • The resulting s-CBB/HP-BVO heterojunction shows improved photocatalytic activity with a total electron consumption rate of 70.63 µmol g h and 79.66% selectivity for CO production, demonstrating the benefits of strain engineering in enhancing halide perovskite photocatalysts.

Article Abstract

Slow charge kinetics and unfavorable CO adsorption/activation strongly inhibit CO photoreduction. In this study, a strain-engineered Cs Bi Br /hierarchically porous BiVO (s-CBB/HP-BVO) heterojunction with improved charge separation and tailored CO adsorption/activation capability is developed. Density functional theory calculations suggest that the presence of tensile strain in Cs Bi Br can significantly downshift the p-band center of the active Bi atoms, which enhances the adsorption/activation of inert CO . Meanwhile, in situ irradiation X-ray photoelectron spectroscopy and electron spin resonance confirm that efficient charge transfer occurs in s-CBB/HP-BVO following an S-scheme with built-in electric field acceleration. Therefore, the well-designed s-CBB/HP-BVO heterojunction exhibits a boosted photocatalytic activity, with a total electron consumption rate of 70.63 µmol g h , and 79.66% selectivity of CO production. Additionally, in situ diffuse reflectance infrared Fourier transform spectroscopy reveals that CO photoreduction undergoes a formaldehyde-mediated reaction process. This work provides insight into strain engineering to improve the photocatalytic performance of halide perovskite.

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Source
http://dx.doi.org/10.1002/smll.202302058DOI Listing

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