Iron With The Synthesis And Electrochemical Properties

The tetraamido macrocyclic ligands iron complex (FeⅢ-TAML) was immobilized in sodium alginate(SA) film on pyrolytic graphite (PG) electrode. Many techniques were employed to monitor the fabrication and properties of FeⅢ-TAML/SA composite films modified on the electrodes, such as ultraviolet-visible spectrophotometry (UV-vis), fourier transform infra-red spectroscopy (FT-IR),scanning electron microscopy (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), square wave voltammetry (SWV), amperometric responses and so on. The direct electrochemical behavior and the electrocatalytic property toward the decomposition of hydrogen peroxide were also studied.In aqueous-ethanol solvents mixtures, the electrochemical parameters were measured. The mechanism of the interaction manner between FeⅢ-TAML and SA was discussed.The experimental data showed that:the fast and reversible electron transfer between FeⅢ-TAML and electrode was achieved both in water and aqueous-organic solvents. The immobilized FeⅢ-TAML within SA films demonstrated reversible redox electrochemical properties, which was originated from Fe(Ⅲ)/Fe(Ⅱ) redox couples, moreover, it showed surface-confined voltammetric behavior. The formal potential shifted linearly dependent on the pH of solutions, it suggested that the direct electron transfer was proton-coupled. With good electrocatalytic properties toward the speed decomposition of H2O2,the FeⅢ-TAML modified on PG electrode showed good catalytic activity and high stability. The UV-vis spectrum and FT-IR were used to monitor and characterize the present of FeⅢ-TAML within SA film,as the result,FeⅢ-TAML in SA film retained its structure.