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<p>Producing hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) using metal oxides is crucial because it offers a cleaner and safer method than traditional methods that use harmful chemicals. Metal oxides such as ZnO can be used as photocatalysts to produce H<sub>2</sub>O<sub>2</sub>. However, their ability to absorb only UV light is limited, and their efficiency is reduced owing to the rapid recombination of charge carriers. By improving these materials, we can enhance the use of light to produce H<sub>2</sub>O<sub>2</sub> more efficiently and sustainably. This study aimed to synthesize ZnO nanorod (NR)/CuO nanoparticle (NP) composites via a facile hydrothermal process to promote photocatalytic H<sub>2</sub>O<sub>2</sub> production. UV-VIS spectroscopy revealed enhanced UV and visible light absorption by the ZnO/CuO composite, while photoluminescence (PL) spectra showed a suppressed emission peak, indicating reduced electron–hole recombination. The calculated conduction and valence band positions confirmed the formation of a type-I heterojunction between ZnO and CuO, contributing to the efficient photocatalytic production of H<sub>2</sub>O<sub>2</sub> under UV light exposure. Compared to ZnO and CuO, the ZnO/CuO composite demonstrated superior H<sub>2</sub>O<sub>2</sub> production, achieving 58&#xa0;mg&#xa0;L<sup>–1</sup> concentration under UV light, highlighting the synergistic effect of CuO.</p> Graphical Abstract <p></p>

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Enhancing Photocatalytic H2O2 Production Through Suppression Electron–Hole Recombination in ZnO/CuO Composite Synthesized via Facile Hydrothermal Method

  • 期刊论文

  • 发表日期：

    2025年1月4日

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  • Safaa El-Nahas,
  • Mostafa M. Elkady,
  • Hassan M. Salman,
  • M. S. Abd El-Sadek

摘要

Producing hydrogen peroxide (H2O2) using metal oxides is crucial because it offers a cleaner and safer method than traditional methods that use harmful chemicals. Metal oxides such as ZnO can be used as photocatalysts to produce H2O2. However, their ability to absorb only UV light is limited, and their efficiency is reduced owing to the rapid recombination of charge carriers. By improving these materials, we can enhance the use of light to produce H2O2 more efficiently and sustainably. This study aimed to synthesize ZnO nanorod (NR)/CuO nanoparticle (NP) composites via a facile hydrothermal process to promote photocatalytic H2O2 production. UV-VIS spectroscopy revealed enhanced UV and visible light absorption by the ZnO/CuO composite, while photoluminescence (PL) spectra showed a suppressed emission peak, indicating reduced electron–hole recombination. The calculated conduction and valence band positions confirmed the formation of a type-I heterojunction between ZnO and CuO, contributing to the efficient photocatalytic production of H2O2 under UV light exposure. Compared to ZnO and CuO, the ZnO/CuO composite demonstrated superior H2O2 production, achieving 58 mg L–1 concentration under UV light, highlighting the synergistic effect of CuO.

Graphical Abstract