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<p>Photocatalytic reactions can be driven by both photochemical and photothermal processes. However, their individual contributions and synergistic effect remain to be clarified. Herein, we investigated the respective roles of these effects using a Cu–TiO<sub>2</sub>/Ti model catalyst that integrated photochemical and photothermal functionalities within a single photocatalytic system. Employing photocatalytic methanol decomposition as a model reaction, the Cu–TiO<sub>2</sub>/Ti catalyst achieved a high H<sub>2</sub> yield rate of 0.511&#xa0;mmol&#xa0;h<sup>−1</sup> with selectivity of 96.6% toward HCHO among oxidation products, attributed to the cooperative action of photochemical and photothermal processes. In situ resonant Auger electron spectroscopy (RAS), together with in situ Cu K-edge X-ray absorption fine structure and excited-state density functional theory calculations, revealed the accumulation of photogenerated electrons at Cu sites from TiO<sub>2</sub>, suggests the possible formation of an electron transfer pathway from TiO<sub>2</sub> to Cu, which promotes stepwise methanol dehydrogenation to HCHO and H<sub>2</sub>. Simultaneously, the photothermal contribution from Ti enhanced catalytic activity by accelerating reaction kinetics and promoting the desorption of HCHO, thereby suppressing its overoxidation to CO.</p>

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Elucidating the Respective Roles of Photochemical and Photothermal Effects in Photocatalytic Methanol Decomposition

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月27日

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  • Qichen Liu,
  • Yida Zhang,
  • Limin Liu,
  • Zixiang Huang,
  • Jiawei Zheng,
  • Shiqin Jian,
  • Haibin Pan,
  • Chi Cao,
  • Hongliang Li,
  • Qing Yang,
  • Yu Bai,
  • Xusheng Zheng

摘要

Photocatalytic reactions can be driven by both photochemical and photothermal processes. However, their individual contributions and synergistic effect remain to be clarified. Herein, we investigated the respective roles of these effects using a Cu–TiO2/Ti model catalyst that integrated photochemical and photothermal functionalities within a single photocatalytic system. Employing photocatalytic methanol decomposition as a model reaction, the Cu–TiO2/Ti catalyst achieved a high H2 yield rate of 0.511 mmol h−1 with selectivity of 96.6% toward HCHO among oxidation products, attributed to the cooperative action of photochemical and photothermal processes. In situ resonant Auger electron spectroscopy (RAS), together with in situ Cu K-edge X-ray absorption fine structure and excited-state density functional theory calculations, revealed the accumulation of photogenerated electrons at Cu sites from TiO2, suggests the possible formation of an electron transfer pathway from TiO2 to Cu, which promotes stepwise methanol dehydrogenation to HCHO and H2. Simultaneously, the photothermal contribution from Ti enhanced catalytic activity by accelerating reaction kinetics and promoting the desorption of HCHO, thereby suppressing its overoxidation to CO.