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<p>The detection of hydrogen peroxide (H₂O₂) is a crucial process in various industries, including food safety. In this study, a cauliflower-like CuO-ZnO composite with p–n junction was successfully synthesized using a straightforward one-pot hydrothermal method. The resulting material demonstrates outstanding electrocatalytic performance for H₂O₂ detection, outperforming the individual components. The electrochemical sensor constructed from the cauliflower-like CuO-ZnO composite exhibits a well-defined linear response in the concentration range 0.0005 to 0.105&#xa0;mmol·L⁻<sup>1</sup> for H₂O₂. The sensor’s limit of detection (LOD) is 0.21&#xa0;µmol·L⁻<sup>1</sup> at a signal-to-noise ratio (S/N) of 3, with a sensitivity of 1582.7 µA·(mmol·L⁻<sup>1</sup>)⁻<sup>1</sup>·cm⁻<sup>2</sup>. Furthermore, the sensor has been successfully applied to detect trace amounts of H₂O₂ in milk samples, showcasing its potential for sensitive electrochemical sensing applications.</p> Graphical Abstract <p></p>

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Cauliflower-like CuO-ZnO modified glassy carbon electrode as an electrochemical platform for the detection of hydrogen peroxide in adulterated milk

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • Haiyan Song,
  • Haobin Hu,
  • Zhijun Li,
  • Yun Wu,
  • Chunxiao He,
  • Yuanyuan Gao,
  • Nana Hou,
  • Qiqi He,
  • Zhenyu Cheng

摘要

The detection of hydrogen peroxide (H₂O₂) is a crucial process in various industries, including food safety. In this study, a cauliflower-like CuO-ZnO composite with p–n junction was successfully synthesized using a straightforward one-pot hydrothermal method. The resulting material demonstrates outstanding electrocatalytic performance for H₂O₂ detection, outperforming the individual components. The electrochemical sensor constructed from the cauliflower-like CuO-ZnO composite exhibits a well-defined linear response in the concentration range 0.0005 to 0.105 mmol·L⁻1 for H₂O₂. The sensor’s limit of detection (LOD) is 0.21 µmol·L⁻1 at a signal-to-noise ratio (S/N) of 3, with a sensitivity of 1582.7 µA·(mmol·L⁻1)⁻1·cm⁻2. Furthermore, the sensor has been successfully applied to detect trace amounts of H₂O₂ in milk samples, showcasing its potential for sensitive electrochemical sensing applications.

Graphical Abstract