Synthesis Of Graphene/metal Nanoparticles Composite And Their Electrochemical Application

Graphene is a new carbon material with a single layer of carbon atoms in a closelypacked honeycomb two-dimensional lattice. Graphene is the basic unit for building otherdimensions of carbon materials，such as fullerene, CNT(carbon nano tube) and graphite.It has a lot of novel and unique physical and chemical properties, such as larger specificsurface area, good thermal conductivity, large strength and good electronic transportproperties, and so forth. Because of their good natures make it popular among thereachers who are in different fields such as energy storage, super capacitor, electrodematerials, catalysis and nanocomposite materials and so on.Graphene which is used as a carrier has great specific surface area to make itbecome an ideal carbon supporting materials. Metal nanoparticles also have higherspecific surface area and stronger catalytic performance. Therefore，metal nanoparticlesand graphene are compound together so that the nanocomposite materials show betterapplication prospects in energy storage, catalysis and other fields. Graphene/preciousmetals have been studied generally, but the graphene/common magnetic nanomaterialsare researched rarely. In this paper, the samples are synthetized by means of chemicalmethod. The the graphene-magnetic nanoparticles composites are well parepared in thelast which have been characterized electric catalytic performance and magnetismperformance.In this paper, the main content is as follows:(1)The graphite oxide is prepared by the method of the improved Hummer and thegraphene is prepared by chemical reduction-reflux method. The the structure andelement of the graphene oxide and graphene are characterized through XRD, Raman,AFM, FT-IR and other test methods. These results indicate clearly that the surface of thegraphene oxide and graphene show the structure of only a single layer, and the layers ofgraphene oxide have a lot of oxygen containing groups which have good hydrophilicity.Additionally, the reunion time of the graphen which is syntheticed by the method ofreflux is extended. (2) We use the flake graphite and metal nitrate as raw materials by the method ofchemical reduction-carbon thermal reduction method to synthesize successfullygraphene-Co nanoparticles, graphene-Fe3O4nanoparticles graphene-Ni nanoparticles andgraphene-Cu nanoparticles. This method is not only cheap, but also easy to get rawmaterials, and its reaction condition is simple and easy to control the experimentalparameters. The safety is higher. Finally, the samples are characterized by the methods ofXRD、TEM and XPS for the structure and components. The results show that thegraphene which is in graphene/nanoparticles has been reducted completely. The samplesare not so much reunion, and metal nanoparticles are relatively uniform load on thesurface of graphene (particle size in20-100nm).(3) The preparation of three kinds of graphene-metal nanoparticles modified glassycarbon electrodes as work electrodes are studied by the method of cyclic voltammetrys inthe pH=7department of Phosphate Buffer Solution for the degradation of thep-nitrophenol. The results of tests show that three kinds of graphene-metal nanoparticlesduring the electrochemical degradation of p-nitrophenol have shown very good catalyticeffect. In addition, magnetic properties of samples were tested through the method of theVSM.