Electrochemical response studies of γ-Fe2O3-CH composite carbon paste modified electrode

摘要

γ-Fe2O3 nanoparticles were synthesized by microwave method and characterized. The average particle size was found 22-50 nm by XRD and AFM. Chitosan was prepared from the crab shell and characterized. γ-Fe2O3-chitosan composite carbon paste modified electrode was prepared and characterized by using XRD, FT-IR and SEM technique. The electrochemical responses of this γ-Fe2O3-CH composite electrode have been studied in potassium ferrocyanide/KCl system using cyclic voltammetry and electrochemical impedance spectroscopy. The cyclic voltammetric and EIS studies indicated better electron transfer of γ-Fe2O3-CH composite(3:1) carbon paste modified electrodes compared to bare, γ-Fe2O3, chitosan composite electrodes. The surface parameters like surface coverage (τ), Diffusion coefficient (D0), and rate constant (kS) were studied. The shelf-life of the developed electrode system is about 12 weeks under refrigerated conditions.