▎ 摘　　要

An effective non-enzymatic H2O2 sensor electrode was fabricated, including nitrogen doped reduced graphene oxide (N-rGO) modified with different amounts of ZnO and incorporated by Pt nanoparticles. ZnO and Pt were fabricated on N-rGO with a hybrid synthesis consisting of hydrothermal and chemical synthesis. The Pt-N-rGO, Pt-10ZnO@N-rGO, Pt-20ZnO@N-r byGO and Pt-40ZnO@N-rGO composites as well as the effect of ZnO amount on the catalysts were studied the SEM (Scanning Electron Microscopy), EDX (Energy Dispersive X-ray Spectroscopy), TEM (Transmission Electron Microscopy), BET (Brunauer-Emmett-Teller method), XRD (X-ray Powder Diffraction). The electro-catalytic activity of the samples for H2O2 reduction was investigated by cyclic voltammetry, electrochemical impedance spectroscopy and the amperometric method. Among the prepared catalysts, Pt-40ZnO@N-rGO was found to have higher sensitivity toward the reduction of H2O2 at - 0.6 V (Ag/ AgCl) because of the synergistic effect between ZnO and Pt nanoparticles that synthesized with the optimum mass ratio. It showed a linear response range from 0.1 mu M to 0.1 mM with a low detection of 0.109 mu M and a high sensitivity of 557 mu A/mM-1. Furthermore, the fabricated sensor presented good selectivity to H2O2 with the existence of other interfering species.