Sensitive Electrochemical Determination of Hydrogen Peroxide Using Copper Nanoparticles in a Polyaniline Film on a Glassy Carbon Electrode

Rapid and accurate determination of hydrogen peroxide is necessary in biochemistry and environmental science. In this paper, a sensitive hydrogen peroxide electrochemical sensor was developed by cyclic voltammetry deposition of polyaniline–copper nanocomposite film on a glassy carbon electrode. The synthesized polyaniline/Cu composites were characterized by scanning electron microscopy and X-ray diffraction. With a typical working potential of 0.4 V (versus Ag/AgCl) and a pH value of 6.0, the prepared electrochemical sensor achieved linear range of 1.0–500 µM for hydrogen peroxide detection. A relative standard deviation of 4.9% for n = 7 and 10.0 µM of H₂O₂ and a limit of detection of 0.33 µM at a signal-to-noise ratio = 3 were observed. The sensor was successfully used for the analysis of tap water, and a spiked recovery of 93.0 ± 2.1% was obtained, further confirming the sensor’s accuracy and feasibility.