The Electrocatalytic Properties Study Of Metal/Graphene Nanocomposites

Graphene is a carbon nanostructure material, which has a single layer of carbonatoms tightly packed into a two-dimensional plane. Due to the unique structure, it hasexcellent electrical conductivity and large surface area. Metal nanoparticles also havethese excellent properties. The metal nanoparticles loaded on graphene tend to increasethe catalytic activity and the reaction active of the material. In this paper, graphenenanocomposites are prepared by modified hummers method, and it was used asprecursor to prepare graphene/metal nanocomposites by different methods. They arePt/graphene, Au/graphene, Pd@Cu/graphene and Pt/Cu/graphene, respectively. Thesegraphene/metal nanocomposites display great catalytic activity and stability. The mainwork contents were listed as follows:First, we prepared the Pt/graphene (Pt/graphene) electrodes, and researched itselectrochemical properties. The prepared nanocatalysts past the TEM, XRD, FT-IR andRaman test, which indicated that platinum nanoparticles were uniform loaded on thegraphene surface with a smaller size. In electrochemical tests, we found that thenanocomposite in the presence of high concentrations of AA can be a good DA and UAdetection.Second, acetylcholinesterase was fixed to the surface of graphene goldnanocompound structure modified electrode by using cysteamine, and the fixedacetylcholinesterase maintained a high activity. A novel acetylcholinesterase biosensorwhich used Au/graphene nanoparticles as raw material was found. The electrochemicaltest indicated that the nanocatalysts hade fast electrochemical response toacetylthiocholine chloride. In addition, this composite material enables rapid detectionof organophosphorus pesticides, while maintaining good stability.Third, the paper designed "one-pot reduction method", superposedpalladium/copper bimetallic on graphene using ethylene glycol as reducing agent, thengot Pd@Cu/RGO. This material was carried on TEM, XRD, XPS and Raman test. Andthe results indicate that the material has a core-shell nanostructures, which means thecatalytic surface area is increased. The result of cyclic voltammetry showed catalyticactivity and stability of Pd/Cu bimetallic core-shell nanoparticle catalysts for ethanoloxidation have a distinct advantage compared to single palladium catalyst and coppercatalyst.Fourth, we propose a simple but effective method: prepared Pt/Cu/RGO by "afacile one-step method" using ethylene glycol as reducing agent. Tests of XRD, TEM, FT-IR, XPS were carried on catalyst. Results show that Pt/Cu bimetallic nanoparticlesloaded on the surface of the graphene were densely and uniformly. The cyclicvoltammetry and chronoamperometry tests indicate Pt/Cu/RGO catalyst has goodcatalytic activity and stability for the methanol oxidation.