Electrochemical Characterization of Redox FeII/FeIII Mediated by ZrO2NPs/GCE Using Cyclic Voltammetry

Abstract

In this article, experimental methods based on cyclic voltammetric technique were used to study the electrochemical analysis of a new modified electrode with zirconium dioxide molecules on the glassy carbon electrode (ZrO2NPs/GCE) to characterize iron ions K4[Fe(CN)6]. These methods also allowed the study of current peaks for oxidation reduction of Fe(II)/Fe(III) using potassium chloride (KCl) solution as electrolytes at different concentration, pH, scanning rates, and stability (reliability) of which these parameters are important in assessing oxidation properties. Also, the diffusion coefficient values of oxidation-reduction reaction for iron ions on the new sensor (ZrO2 NPs/GCE) was determined using Randles-Seveik equation as Dfa = 2.03 ×10-5 cm2 /sec and Dfc = 7.12 × 10-5 cm2 /sec, respectively. It was found the modified electrode ZrO2NPs/GCE acts as a good sensor with high detection limit of iron ions in electrolyte. It can be used the modified electrode in different electrochemical applications because of its higher conductivity.