New Fe2O3 Nanoparticles Modified Carbon Paste Electrode: A Cyclic Voltammetric Study

Document Type : Original Article

Authors

Department of Medical Physics, Hilla University College, Babylon, Iraq.

Abstract

The cyclic voltammetry (CV) technique was accustomed to look into the electro oxidation of iron ions in water using a novel carbon paste electrode CPE enhanced with iron oxide nanoparticles. The revised electrode exhibited a high resolving function, allowing the overlapping voltametric response of Fe-ion to be resolved into a single well-defined peak. The voltage differential between Epa (anodic) and Epc (cathodic) was higher than 200 mV; this range is referred to as the quest-reversible mechanism. At temperatures ranging from 15 to 35 °C, the kinetics of the electrode were investigated. Voltammogram data revealed a rise in temperature, which resulted in an increase in negative shift, diffusion electron transfer in the Fe redox reaction. The Randles-Sevcik equation yielded a diffusion coefficient of 4.9 x 10-5; the rate constant K was 2.3 x 10-4; and the peak current of Fe-ion rose linearly with concentrations ranging from 1 to 5 ppm.

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