A Novel Nonenzymatic Hydrogen Peroxide Sensor Based on Pd Nanoparticles Modified Electrode

摘要

Pd nanoparticles have been prepared on the surface of glassy carbon electrode (GCE) by electrochemical deposition method and applied for the nonenzymatic detection of H_2O_2. Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) were employed to investigate the as-prepared Pd nanoparticles on the surface of GCE. The electrochemical properties of Pd nanoparticles modified GCE were also characterized by cyclic voltammetry and chronoamperometry. The results showed that Pd nanoparticles modified GCE had a favorable catalytic ability for the reduction of H2_O_2 in PBS medium (pH=7.6). At an applied potential of -0.06 V, the nonenzymatic H_2O_2 sensors produce high and reproducible sensitivity to H2O2 with 52.45 μA/mmol?dm~(-3). Linear responses were obtained over a concentration range from 0.15 mmol?dm~(–3) to 18 mmol?dm~(–3) with a detection limit of 25 μmol?dm~(–3) (S/N=3). Additionally, it exhibited a rapid response time (within 1s), which was much faster than some nonenzymatic H_2O_2 sensors.