Electrochemical study of Magnetite-CH composite carbon paste modified electrode

摘要

Magnetite nanoparticles were synthesized by coprecipitation and characterized. The average particle size was 22-50 nm by XRD and AFM. Chitosan was prepared from crab shells and characterized. Magnetite-chitosan composite carbon paste modified electrode was prepared and characterized by using XRD, FT-IR and SEM technique. The electrochemical responses of this Magnetite-CH composite electrode were studied in potassium ferrocyanide/KCl system using cyclic voltammetry and electrochemical impedance spectroscopy. The cyclic voltammetric and EIS studies indicated better electron transfer of magnetite-CH composite (3: 1) carbon paste modified electrodes compared to bare, magnetite, chitosan composite electrodes. The surface parameters like surface coverage ((tau)), Diffusion coefficient (D-0), and rate constant (k(S)) were studied. The shelf-life of the developed electrode system is about 12 weeks under refrigerated conditions.