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

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 mu M, its sensitivity and linear range were calculated as 142.47 mu A mu M-1 and 250-3560 mu M, 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.