▎ 摘　　要

The electrodeposition of a zinc-graphene composite has been achieved for the first time using a -graphene quantum dot (GQD) electrode. At the GQD electrode, the electrochemical reduction of zinc ion is shifted to a lesser negative potential with the complementary anodic peak due to the oxidation of the composite shifted toward a positive potential as compared to zinc ion reduction in the GQD bath. The charge ratio of anodic to cathodic peaks is one that represents a gain of nearly ten percent over the conventional Zn/Zn2+ in the energy storage systems. In galvanostatic electrolysis, the deposition of zinc -graphene composite is carried out under neutral and acidic conditions. The X-ray diffraction of the electrolytically prepared composite shows distinct features of 2 theta reflection at 8 due to (001) plane of -graphene, in addition to the characteristic reflections at 38.9 degrees,43.2 degrees, 54.3 degrees, 70.1 degrees and 90 degrees arising from Zn at (002), (100), (101), (102) and (110). A large scale preparation of the zinc -graphene composite has been achieved with a zinc plate as the working electrode in the GQD bath. The thermogravimetric analysis (TGA) of the composite shows a distinct weight loss that is due to breakdown of the composite. The interaction of GQD with zinc ion has been examined by fluorescence spectroscopy that shows quenching of the fluorescence of GQD. Scanning electron microscopy and energy dispersion X-ray analysis (EDAX) shows a string-like structure with peaks for carbon and zinc in EDAX. The electrochemical data on zinc/zinc-graphene composite reveals that it functions ideally as a charge storage material. Contact angle measurements reveal it to have hydrophilicity.