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Abstract <p>Photocatalytic processes utilizing the energy of light quanta to synthesize valuable compounds are studied quite widely, but particular attention is paid to the development of effective and stable photocatalysts. The present study considers the transformation of photocatalysts based on TiO<sub>2</sub> modified with copper and its oxide compounds (CuO<sub><i>x</i></sub>) in the conditions of CO<sub>2</sub> reduction under the LED irradiation (397&#xa0;nm). The influence of TiO<sub>2</sub> precalcination on the state of the copper cocatalyst is demonstrated. It is shown by in situ X-ray absorption (XANES) that modifying the calcined TiO<sub>2</sub> photocatalyst with copper results in higher content of (0) and (1+) copper sates than in the case of the non-calcined photocatalyst. It is established that the fraction of metal copper in both photocatalysts increases during the reaction due to the accumulation of photogenerated electrons on the copper cocatalyst.</p>

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Transformation of CuOx/TiO2 Photocatalysts During CO2 Reduction

  • 期刊论文

  • 发表日期：

    2025年3月28日

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  • A. A. Saraev,
  • A. Y. Kurenkova,
  • E. A. Kozlova

摘要

Abstract

Photocatalytic processes utilizing the energy of light quanta to synthesize valuable compounds are studied quite widely, but particular attention is paid to the development of effective and stable photocatalysts. The present study considers the transformation of photocatalysts based on TiO2 modified with copper and its oxide compounds (CuOx) in the conditions of CO2 reduction under the LED irradiation (397 nm). The influence of TiO2 precalcination on the state of the copper cocatalyst is demonstrated. It is shown by in situ X-ray absorption (XANES) that modifying the calcined TiO2 photocatalyst with copper results in higher content of (0) and (1+) copper sates than in the case of the non-calcined photocatalyst. It is established that the fraction of metal copper in both photocatalysts increases during the reaction due to the accumulation of photogenerated electrons on the copper cocatalyst.