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Keywords:

  • Electrodeposition;
  • Gold;
  • Nanoparticles;
  • Ordered mesoporous carbon;
  • Hydrogen peroxide

Abstract

A facile and controllable electrodeposition method was developed to directly attach gold nanoparticles (GNPs) on ordered mesoporous carbon (OMC). The GNPs on OMC substrate were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectrometer (XPS), respectively. A nonenzymatic hydrogen peroxide (H2O2) sensor was fabricated on GNPs-OMC/GCE. The sensor demonstrated a fast amperometric response (2.5 s), a wide linear range toward H2O2 concentrations between 2.0×10−6 and 3.92×10−3 M (R=0.999), and a low detection limit of 0.49 µM (S/N=3). Moreover, it exhibited good reproducibility and long-term stability. The excellent electrocatalytical activity might be attributed to the synergistic effect of OMC and GNPs.