▎ 摘　　要

A facile, template-free and low-cost strategy has been developed to construct a 3D nitrogen (N) doped graphene aerogel (GA) by the incorporation of dopamine (DA). 3D-NGA can be served as a highly efficient electrocatalyst in the reduction of H2O2, which is then applied in the nonenzymatically electrochemical determination of H2O2. The structure and morphology of hollow 3D-NGA were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Electrocatalytic activity of 3D-NGA was investigated by cyclic voltammetry (CV) and chronoamperometiy, exhibiting a direct for the reduction of H2O2 at 0.5V. This constructing sensor was applied in detection of H2O2 with a detection limit of 0.05 mM, a linear detection range from 0.2 to 35 mM. Due to superior catalytic performance and low cost of 3D-NGA electrode, it shows great potential in applications for direct sensing of H2O2. (C) 2015 Elsevier B.V. All rights reserved.