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<p>In recent years, zinc oxide/copper oxide (ZnO/CuO) heterojunctions have attracted significant interest due to their excellent optical properties, biocompatibility, and synergistic charge-diffusion capabilities that mitigate the individual drawbacks of both ZnO and CuO. This review comprehensively explores the charge-diffusion pathways in ZnO/CuO, highlighting how the traditional p–n junction model falls short of the more scientifically robust S-scheme heterojunction model in explaining the material’s strong redox potential. Furthermore, the review details various synthesis strategies-such as individual growth, simultaneous precipitation, and plant extract-assisted controlled growth-alongside critical modifications including metal and non-metal doping, facet engineering, and heterojunction structuring. Finally, the practical viability of ZnO/CuO and its derivatives is evaluated, emphasizing their high efficiency in the photodegradation of highly resistant, multi-ring organic pollutants, photoproduction of green energy carriers, and current advances in the application of ZnO/CuO in various fields. Limitations in the current utilization of ZnO/CuO-based heterojunctions are also provided in detail.</p> Graphical abstract <p></p>

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Synthesis and modification of zinc oxide/copper oxide for photocatalytic degradation of organic compounds and photoproduction of hydrogen peroxide: a review

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Le Minh Huong,
  • Nguyen Hung Vu,
  • Nguyen Minh Dat,
  • Nguyen Thanh Hoai Nam,
  • Nguyen Huu Hieu

摘要

In recent years, zinc oxide/copper oxide (ZnO/CuO) heterojunctions have attracted significant interest due to their excellent optical properties, biocompatibility, and synergistic charge-diffusion capabilities that mitigate the individual drawbacks of both ZnO and CuO. This review comprehensively explores the charge-diffusion pathways in ZnO/CuO, highlighting how the traditional p–n junction model falls short of the more scientifically robust S-scheme heterojunction model in explaining the material’s strong redox potential. Furthermore, the review details various synthesis strategies-such as individual growth, simultaneous precipitation, and plant extract-assisted controlled growth-alongside critical modifications including metal and non-metal doping, facet engineering, and heterojunction structuring. Finally, the practical viability of ZnO/CuO and its derivatives is evaluated, emphasizing their high efficiency in the photodegradation of highly resistant, multi-ring organic pollutants, photoproduction of green energy carriers, and current advances in the application of ZnO/CuO in various fields. Limitations in the current utilization of ZnO/CuO-based heterojunctions are also provided in detail.

Graphical abstract