Abstract A novel and low cost electrochemical method has been developed for the non-enzymatic detection of the hydrogen peroxide using cobalt ferrite (CoFe2O4), carbon nano tubes (CNTs) modified glassy carbon electro (GCE), and the sensor has been named as CoFe2O4/CNTs/GCE. The CoFe2O4/CNTs nanocomposite has been successfully synthesized through a facile one-step hydrothermal method. The crystal structure, morphology and composition of the nanocomposite are characterized by XRD, Raman, XPS, FE-SEM, and HR-TEM measuremnets. The particle size of ferrite nano composite is obtained as ~17 nm. Electrochemical properties of the CoFe2O4/CNTs/GCE are investigated using various electrochemical techniques such as; cyclic voltammetry, electrochemical impedance spectroscopy and square wave voltammetry. The constructed CoFe2O4/CNTs/GCE showed superior electrochemical activity towards H2O2 sensing compared with the CoFe2O4/GCE and bare GCE. The sensor produces a linear response in the range of 5–50 μM and the detection limit is obtained as 0.05 μM (S/N = 3) using chronoamperometry techniques and the square wave voltammetry technique generated the linear response in the range of 5–100 μM and the detection limit of 0.02 μM (S/N = 3). The developed sensor has shown suitable anti-interfering property with good stability towards the detection of H2O2. The CoFe2O4/CNTs modified electrode has been applied to determine H2O2 in the commercially available juice samples. The performance of the sensor is comparable or superior to several others commonly sensors used for the analysis of H2O2, which indicates its promising practical application.

中文翻译：

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基于CoFe2O4/CNTs纳米复合修饰电极的新型低成本非酶促过氧化氢传感器

摘要 使用铁酸钴 (CoFe2O4)、碳纳米管 (CNTs) 修饰的玻碳电 (GCE) 开发了一种新型低成本电化学方法，用于非酶法检测过氧化氢，并将该传感器命名为 CoFe2O4。 /CNTs/GCE。CoFe2O4/CNTs 纳米复合材料已通过简便的一步水热法成功合成。纳米复合材料的晶体结构、形貌和组成通过 XRD、拉曼、XPS、FE-SEM 和 HR-TEM 测量进行表征。铁氧体纳米复合材料的粒径为~17 nm。使用各种电化学技术研究 CoFe2O4/CNTs/GCE 的电化学性质，例如；循环伏安法、电化学阻抗谱和方波伏安法。与 CoFe2O4/GCE 和裸 GCE 相比，构建的 CoFe2O4/CNTs/GCE 对 H2O2 传感显示出优异的电化学活性。传感器在 5–50 μM 范围内产生线性响应，使用计时电流法技术获得的检测限为 0.05 μM (S/N = 3)，方波伏安法技术在 5–100 范围内产生线性响应μM，检测限为 0.02 μM (S/N = 3)。所开发的传感器对H2O2的检测显示出良好的抗干扰性和良好的稳定性。CoFe2O4/CNTs 修饰电极已用于测定市售果汁样品中的 H2O2。该传感器的性能与用于分析 H2O2 的其他几种常用传感器相当或优于其他几种传感器，这表明其具有广阔的实际应用前景。