Investigation on Electrocatalytic Performance of Chitosan-Copper Complex Modified Electrode to Hydrogen Peroxide

KeyWord:copper  chitosan  H2O2  modified electrode  electrocatalysis

Abstract:

      A modified electrode based on chitosan-copper complex£¨CTS-Cu£© was developed for the quick determination of hydrogen peroxide£¨H2O2£©.The CTS-Cu complex was prepared via the coordination interaction of chitosan and copper£¨¢ò£© salt and was used to modify glassy carbon electrode£¨GCE£©.The electrocatalytic performance of the resulting CTS-Cu modified electrode£¨CTS-Cu/GCE£© to H2O2 was investigated by cyclic voltammetry£¨CV£© and chronoamperometry£¨CA£©.The mechanism of the catalytic reaction was further discussed.The experimental conditions were optimized and listed as follows£º0.1 mol/L phosphate buffer solution£¨PBS£¬pH 7.0£© was used as the reaction medium£¬the concentration of copper£¨¢ò£© in the CTS-Cu modified solution was 6 mmol/L£¬and the applied potential was-0.20 V.Under the optimum conditions£¬the peak current of the modified electrode was proportional to the concentration of H2O2 in the range of 3.9¡Á10-5-1.4¡Á10-3 mol/L with a detection limit of 3.6¡Á10-6 mol/L.The relative standard deviation£¨RSD£¬n=5£© was 3.4%.The results indicated that the preparation method was simple£¬and the employment of the modified electrode was also convenient.Moreover£¬the modified electrode has the advantages of high sensitivity£¬excellent electrocatalytic performance to H2O2£¬and good anti interference ability in the determination of H2O2 with satisfactory result.