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<p>Photothermal catalytic CO<sub>2</sub> conversion into chemical fuels is of economic value, yet it faces the challenges of low efficiency and instability. To address these issues, this study developed a solar-light-driven catalysis system using Au<sub>8</sub>/CeO<sub>2</sub> and concentrated irradiation to enhance CO<sub>2</sub> conversion performance. This system contributes to a significant solar-to-chemical energy conversion efficiency improvement from 0.12 to 0.35‰. Simultaneously, the CH<sub>4</sub> production rate was improved by 21.7-fold (from 12.9 to 280.2&#xa0;μmol g<sup>−1</sup> h<sup>−1</sup>) compared to the benchmark CeO<sub>2</sub> photocatalyst. During the reaction, Au clusters demonstrated enhanced light absorption capacity and elevated surface temperature of the photocatalyst, which increased charge carrier concentration, up-shifted the Fermi level, and reduced apparent activation energy. These effects synergistically promoted reaction efficiency. This catalysis system offers an efficient and sustainable approach for solar-driven CO<sub>2</sub> conversion, presenting promising potential for practical applications in renewable energy utilization.</p> Graphical Abstract <p></p>

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Au Cluster-Decorated CeO2 for High-Efficiency Photothermal Catalytic Reduction of CO2 to CH4

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Changjun You,
  • Junhai Wang,
  • Yuan Yin,
  • Boyi Yang,
  • Yitao Si,
  • Jiancheng Zhou

摘要

Photothermal catalytic CO2 conversion into chemical fuels is of economic value, yet it faces the challenges of low efficiency and instability. To address these issues, this study developed a solar-light-driven catalysis system using Au8/CeO2 and concentrated irradiation to enhance CO2 conversion performance. This system contributes to a significant solar-to-chemical energy conversion efficiency improvement from 0.12 to 0.35‰. Simultaneously, the CH4 production rate was improved by 21.7-fold (from 12.9 to 280.2 μmol g−1 h−1) compared to the benchmark CeO2 photocatalyst. During the reaction, Au clusters demonstrated enhanced light absorption capacity and elevated surface temperature of the photocatalyst, which increased charge carrier concentration, up-shifted the Fermi level, and reduced apparent activation energy. These effects synergistically promoted reaction efficiency. This catalysis system offers an efficient and sustainable approach for solar-driven CO2 conversion, presenting promising potential for practical applications in renewable energy utilization.

Graphical Abstract