Korean Journal of Chemical Engineering, Vol.33, No.6, 1948-1953, 2016
Electrochemical study of Magnetite-CH composite carbon paste modified electrode
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 (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.
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