Gold Nanoparticles Electrodeposited on Ordered Mesoporous Carbon as an Enhanced Material for Nonenzymatic Hydrogen Peroxide Sensor

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 x 10(-6) and 3.92 x 10(-3) M (R = 0.999), and a low detection limit of 0.49 mu M (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.