A novel low cost nonenzymatic hydrogen peroxide sensor based on CoFe2O4/CNTs nanocomposite modified electrode

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. [Display omitted] •Cobalt ferrite and CNT nano composite has been synthesized using hydrothermal route.•Nano composite materials has been characterized with suitable redox states.•Materials shown excellent electrocatalytic activity for hydrogen peroxide oxidation.•Analytical method is developed with limit of detection 0.02 μM (S/N = 3).•Chronoamperometry could be obtained, suitable for continuous monitoring.