▎ 摘　　要

Graphene anchored with nanocrystal ZnO was synthesized by a facile in situ one-pot hydrothermal route. The nanocomposite was characterized by X-ray diffraction (XRD), Raman spectra (RS), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), scanning electron spectroscopy (SEM), and transmission electron microscopy (TEM). The electrochemical properties of the nanocomposite were investigated by galvanostatic cycling and cyclic voltammetry (CV). It was found that ZnO particles with a size of around 30-40 nm are homogeneously anchored on graphene due to the interaction between the precursors. A layered structure has formed by the alternating stacking of graphene sheets and ZnO nanoparticles. The electrochemical tests showed that the ZnO/graphene nanocomposite yields an initial charge capacity of 420 mAh g(-1), and that the nanocomposite exhibits an obviously improved cycling stability compared to bare ZnO because of the buffering, confining and conducting effects of the incorporated graphene. Electrochemical impedance spectroscopy (EIS) was used to understand the effect of graphene on the electrochemical properties of nanocrystal ZnO.