Copper Nanoparticles with Copper Hexacyanoferrate and Poly(3,4-ethylenedioxythiophene) Hybrid Film Modified Electrode for Hydrogen Peroxide Detection

Abstract

An electroactive polynuclear hybrid films of copper nanoparticles with copper hexacyanoferrate (copper NPs-CuHCF) have been deposited on PEDOT electrode surfaces from KNO3 solution (pH 5.6) containing CuCl2 and K3[Fe(CN)6] by multiple scan cyclic voltammetry. The films were characterized using field emission scanning electron microscopy and energy dispersive spectroscopy. The advantages of these films were demonstrated for the detection of hydrogen peroxide (H2O2) using cyclic voltammetry and amperometric techniques. The electrocatalytic reduction of H2O2 at different electrode surfaces, such as the bare GCE, the CuHCF/PEDOT/GCE, and the copper NPs/PEDOT/GCE modified electrodes, was determined in KNO3 solution (pH 5.6). The H2O2 electrochemical sensor exhibited a linear response range (from 1 x 10-6 to 5.4 x 10-4 M, R2 = 0.9975, lowest detection limit (1 ß 10–7 M) and fast response time (3 s) for H2O2 determination. In addition, the copper NPs-CuHCF/PEDOT/GCE was advantageous in terms of its simple preparation, specificity, stability and reproducibility.