▎ 摘　　要

An enzyme-free hydrogen peroxide (H2O2) electrochemical sensor was constructed through building carbon nanotubes (CNTs), reduced graphene oxide (RGO) and platinum nanoparticles (Pt NPs) nanocomposite with a 3D structure modified glassy carbon electrode (GCE). Scanning electron microscopy (SEM) and energy -dispersive X-ray spectroscopy (EDS) analysis were used to characterize the morphology and element distribution of the modified electrodes RGO/CNTs-Pt/GCE. The electrocatalytic reduction performance of RGO/CNTs-Pt on H2O2 was investigated by cyclic voltammetry (CV) and chronoamperometry (i-t). Because of the synergistic effect of enhanced conductivity and catalytic ability of the carbon based nanocomposites (RGO/CNTs) and Pt NPs implanted 3D interfaces, the sensor shows excellent electrocatalytic property on H202 reduction. Under the optimized conditions, a high sensitivity (347 +/- 5 mu A mM(-1) cm(-2), n = 3) and a linear range (0.0003 - 0.018 mM and 0.01 - 4.0 mM) with a low detection limit (similar to 0.31 mu M) operated at the working voltage of -0.2 V (vs. Ag/AgCl) are achieved by RGO/CNTs-Pt/GCE. In addition, the sensor is resistant to interference and maintains long-term stability and has been successfully used to detect the spiked H2O2 in milk samples, which has important significance for monitoring the abuse of H2O2 in milk.