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<p>The restricted electron transport and slow surface reaction kinetics are two fundamental limitations affecting the photocatalytic efficiency of covalent organic frameworks (COFs). To address these challenges and enhance charge separation, this study utilizes an <i>in-situ</i> growth strategy to incorporate MoO<sub>3−<i>x</i></sub> into COF (denoted as BTTA), forming MoO<sub>3−<i>x</i></sub>/COF composites (MOCOF). These composites demonstrate significantly enhanced solar fuel performance through photocatalytic CO<sub>2</sub> reduction. <i>In-situ</i> irradiated X-ray photoelectron spectroscopy and electron spin resonance analyses confirm the presence of an S-scheme carrier transfer mechanism, which effectively spatially separates photogenerated carriers with substantial redox potential. The nanoarchitecture of MOCOF-2 demonstrates the capability to efficiently convert CO<sub>2</sub> into valuable CO and CH<sub>4</sub> fuels, achieving reduction rates of 8.7 and 4.6 µmol·g<sup>−1</sup>·h<sup>−1</sup>, respectively. This study provides a valuable reference for the rational design of COF-based S-scheme heterojunction photocatalysts aimed at solar fuel production.</p>

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Efficient CO2 Photoreduction into Solar Fuels over MoO3−x/COF S-Scheme Photocatalyst

  • 期刊论文

  • 发表日期：

    2025年4月30日

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  • Chuang Liu,
  • Tengyuan Gao,
  • Guohong Wang,
  • Qiang Cheng,
  • Kai Wang

摘要

The restricted electron transport and slow surface reaction kinetics are two fundamental limitations affecting the photocatalytic efficiency of covalent organic frameworks (COFs). To address these challenges and enhance charge separation, this study utilizes an in-situ growth strategy to incorporate MoO3−x into COF (denoted as BTTA), forming MoO3−x/COF composites (MOCOF). These composites demonstrate significantly enhanced solar fuel performance through photocatalytic CO2 reduction. In-situ irradiated X-ray photoelectron spectroscopy and electron spin resonance analyses confirm the presence of an S-scheme carrier transfer mechanism, which effectively spatially separates photogenerated carriers with substantial redox potential. The nanoarchitecture of MOCOF-2 demonstrates the capability to efficiently convert CO2 into valuable CO and CH4 fuels, achieving reduction rates of 8.7 and 4.6 µmol·g−1·h−1, respectively. This study provides a valuable reference for the rational design of COF-based S-scheme heterojunction photocatalysts aimed at solar fuel production.