In the present work, ultrafine Cu₂O nanoparticles decorated MnO₂ nanocomposite (Cu₂O@MnO₂) was prepared by the in-situ growth method. The morphologies of nanomaterials were characterized by transmission electron microscopy, scanning electron microscopy, X-ray diffraction, and Raman spectroscopy, respectively. The poor electrical conductivity of MnO₂ nanosheets and the severe aggregation of Cu₂O nanoparticles could be sufficiently overcome through the formation of nanocomposite. The electrochemical results proved that the Cu₂O@MnO₂ nanocomposite exhibited a better electrocatalytic effect towards the reduction of H₂O₂ than pure MnO₂ nanosheets and Cu₂O nanoparticles due to the synergistic effect between these materials. Under the optimal condition, H₂O₂ could be detected in the range of 0.5–20 μM with a detection limit of 0.2 μM. The modified electrode exhibited satisfactory stability and reproducibility, and could be used to detect H₂O₂ in real sample. The results revealed that nanocomposites containing different metal oxides owned great potential application in designing high performance non-enzymatic electrochemical sensors.

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中文翻译：

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在 MnO2 纳米片上原位合成超细 Cu2O 纳米粒子用于过氧化氢的高效非酶促电化学传感

在目前的工作中，通过原位生长法制备了超细Cu ₂ O纳米粒子修饰的MnO ₂纳米复合材料（Cu ₂ O@MnO _{2 ）。}分别通过透射电子显微镜、扫描电子显微镜、X 射线衍射和拉曼光谱对纳米材料的形貌进行了表征。_{MnO 2}纳米片的导电性差和Cu ₂ O纳米粒子的严重聚集可以通过纳米复合材料的形成得到充分克服。电化学结果证明Cu ₂ O@MnO ₂纳米复合材料对H _{2的还原表现出更好的电催化效果}O ₂比纯MnO ₂纳米片和Cu ₂ O纳米片由于这些材料之间的协同作用。在最佳条件下，H ₂ O ₂的检测范围为0.5–20 μM，检出限为0.2 μM。修饰电极具有良好的稳定性和重现性，可用于实际样品中H ₂ O ₂的检测。结果表明，含有不同金属氧化物的纳米复合材料在设计高性能非酶促电化学传感器方面具有巨大的应用潜力。

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