A Novel H_2O_2 Amperometric Sensor based on Prussian Blue/Palladium Nanoparticles/Graphene Oxide Nanocomposite Modified Electrode

A novel nanocomposite consisting of graphene oxide (go), palladium nanoparticles (pdnps) and prussian blue (pb) was used to fabricate a non-enzymatic hydrogen peroxide (h_2o_2) sensor. a pencil graphite electrode (pge) was modified with the mentioned nanocomposite (pb/pd/go-pge) and characterized by several techniques including scanning electron microscopy (sem), electrochemical impedance spectroscopy (eis) and cyclic voltammetry (cv). the sensor showed a significant better electrocatalytic activity for the reduction of hydrogen peroxide in comparison with the single go-pge, pb/go-pge and pd/go-pge. this was attributed to the synergistic effect of pb, pd, and go nanoparticles. the values of diffusion coefficient, d, and electroreduction kinetics parameters including electron transfer coefficient, alpha, and catalytic rate constant, k, were 9.61×10^-6 cm^2 s^-1,0.5 and 7.02×10^5 cm^3 mol^-1 s^-1 respectively. furthermore, the proposed sensor demonstrated a high level of the overall performance for the analysis of h_2o_2 using hydrodynamic amperometry in the concentration range from 0.2×10^-6 to 0.5×10^-3 mol l^-1 and detection limit of 0.078×10^-6 mol l^-1 with good stability, repeatability, and selectivity. this modified electrode was also used successfully for the determination of h_2o_2 in real samples such as, mother’s milk, and rain water.