Redox activity of copper species immobilized poly(o-aminophenol)/multi-walled carbon nanotube (Cu@MWCNT-POAP) composite is reported for direct electrocatalysis towards detection of H₂O₂. The Cu@MWCNT-POAP composite was prepared by a single step in situ electrochemical method. The as-prepared Cu@MWCNT-POAP composites were characterized by field emission scanning electron microscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray diffraction, and electrochemical impedance spectroscopy. Cyclic voltammetry (CV) studies highlighted the good redox behavior of the Cu@MWCNT-POAP composite resulting from direct electron transfer behavior of the copper redox couple (Cu²⁺/Cu⁺). The Cu@MWCNT-POAP composite displayed superior electrocatalytic activity and high performance towards detection of H₂O₂ because of its large surface area and homogenous immobilization of Cu species on the MWCNT-POAP composite. The analytical sensitivity and detection limit of the sensor were 831 μA mM⁻¹ cm⁻² and 30 nM, respectively. In addition, bio-catalytic activity of the sensor was evaluated using the Michaelis–Menten constant. The Cu@MWCNT-POAP composite showed excellent stability and reproducibility, and good recoveries for determination of H₂O₂ in milk, bleach cream, and contact lens solutions.

中文翻译：

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一锅电化学制备具有优异电催化活性的铜固定化聚邻氨基苯酚/ MWCNT复合材料，用作H ₂ O ₂传感器

据报道，固定化铜物种的聚邻氨基苯酚/多壁碳纳米管（Cu @ MWCNT-POAP）复合材料的氧化还原活性可用于直接电催化检测H ₂ O ₂。通过一步原位电化学方法制备Cu @ MWCNT-POAP复合材料。制备的Cu @ MWCNT-POAP复合材料通过场发射扫描电子显微镜，傅立叶变换红外光谱，拉曼光谱，X射线衍射和电化学阻抗谱进行了表征。循环伏安法（CV）研究强调了Cu @ MWCNT-POAP复合材料的良好氧化还原行为，这是由于铜氧化还原对（Cu ²⁺ / Cu ⁺）。Cu @ MWCNT-POAP复合材料由于具有较大的表面积和将铜种类均匀地固定在MWCNT-POAP复合材料上，因此具有优异的电催化活性和对H ₂ O _2的检测性能。传感器的分析灵敏度和检测极限分别为831μAmM ^-1 cm ^-2和30 nM。此外，传感器的生物催化活性使用米氏（Michaelis–Menten）常数进行了评估。Cu @ MWCNT-POAP复合材料显示出优异的稳定性和可重复性，并且在测定牛奶，漂白霜和隐形眼镜溶液中的H ₂ O _2时具有良好的回收率。