The electrochemical fabrication of Ag nanoparticles decorated poly(l-cysteine) modifed electrode for non-enzymatic H2O2 sensor

Abstract

In this study, Ag nanoparticles decorated poly(l-cysteine) (PCs) electrodes (Ag@PCs) were developed for the non-enzymatic determination of H₂O₂. Additionally, the electrochemical synthesis of Ag@PCs nanostructures on the pencil graphite electrode surface was achieved for the first time. Different techniques such as X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, and field emission scanning electron microscopy were used in the analytical and morphological characterization of the produced Ag@PCs modified electrodes. As-prepared Ag@PCs electrodes were examined as electrode materials in the non-enzymatic determination of H₂O₂. Electrochemical determination of H₂O₂ was investigated using cyclic voltammetry and chronoamperometry techniques. While the detection limit of the sensor was 0.26 µM, its sensitivity and linear range were calculated as 142.47 μA μM⁻¹ and 250−3560 µM, respectively. Moreover, high selectivity towards H₂O₂ was achieved in the presence of interfering species at the Ag@PCs electrode. Ag@PCs electrodes have great potential for applications involving the electrochemical detection of H₂O₂.