Electrochemical Sensors and Determination for silver ion by Cyclic Voltammetry at iodine-coated Platinum nanoparticles electrode

Abstract

The platinum nanoparticle electrode, modified by iodine (PtNPs/I), was designed to simultaneously determine the use of Cyclic Voltammetry (CV) for silver ion. The analyzed maximum anodic peak current and maximum anodic potential were performed. The platinum nanoparticles deposited were characterized by electron dispersive X-ray spectroscopy (EDX), cyclic voltammetry and scanning electron microscope (SEM). The SEM micrograph shows that the size, shape, and homogeneity of platinum nanostructures are affected by deposition time and the frequency of the potential regime using the parameters El= -0.4V, Eh=0V, d_E/d_T = 100 mV/s, frequency of 100 Hz, 2 min deposition time and concentration of platinum solution 10^-4 M. The purpose of this work is to investigate the catalytic properties of the nanostructure platinum. It is found that the iodine monolayer was absorbed irreversibly to platinum nanostructured electrodes. Cyclic voltammetry experiments on iodine-coated platinum electrodes revealed their remarkable inertness to molecular adsorption, implying suppression of surface processes, interferences, and the overall current background in voltammetric measurements. Potentiostat adsorption of iodine at 0.20 V was used to create iodine-coated platinum electrodes. In 0.5M H₂SO₄, the passive potential window (working potential range) is approximately from -0.10 to 0.95 V. Voltammetric measurements of Ag+ on the iodine-coated electrode revealed a linear relationship between the anodic peak current and the silver ion bulk concentration. With a correlation coefficient of 0.993, the detection limit was 6.8 X 10^-9 M.