Electrochemical Characterization of the Redox Couple of [Fe(CN)6]3-/[Fe(CN)6]4- Mediated by a Grafted Polymer Modified Glassy Carbon Electrode

概要

論文の詳細を見る
A glassy carbon electrode (GCE) was modified to mediate a grafted polymer GP (polystyrene was grafted with acrylonitrile as a monomer using gamma irradiation) by using a solution evaporation method to produce a new modified electrode GP/GCE. The redox process of K3[Fe(CN)6] during cyclic voltammetry was studied using the GP/GCE. It was found that the peak separation (ΔEpa,c) between the redox peaks of ferricyanide ion in aqueous solution is 82 mV and the current ratio of redox peaks, (Ipa/Ipc) is 1 for the GP/GCE, indicating that good reversibility with good conductivity of the modified electrode. Hence, it can be used for voltammetric analysis. The physical properties of the modified electrode GP/GCE have good hardness, high adhesion to metal surfaces of electrode collectors, solubility and the stability of the GP on GCE at different pH levels. Also, the sensitivity under conditions of cyclic voltammetry is significantly dependent on the pH, the electrolyte used and the scan rate. In different scan rates two oxidation peaks and two reduction peaks of Fe (III) was observed in reversible process: Fe(III) / Fe(II) and Fe(II)/Fe(0).