▎ 摘　　要

Palladium/graphene nanocomposites (Pd/GN) were synthesized through a rapid, microwave irradiation, "one pot" method with epigallocatechin gallate (EGCG) as a reducing agent. The loading amount and size of Pd nanoparticles in Pd/Graphene nanocomposites could be controlled by the irradiation time and the ratio of the graphite oxide (GO) and H2PdCl4. Results showed that Pd nanoparticles were well dispersed on the surface of graphene in Pd/GN nanocomposite. When the additive amount of graphene oxide (GO) was 0.25 mL and the microwave irradiation time was 1 min, the size of Pd nanoparticles was about 10 nm. The electro-catalytic activity of the as-prepared Pd/GN towards the oxidation of methanol was studied by cyclic voltammetry (CV) and chronoamperometry (CA) methods. The electrochemical active area (ECSA) value of Pd/GN nanocomposite catalysts was about 60.5 m(2)/g, which was 1.97 times higher than that of the commercial Pd/C catalyst (30.7 m(2)/g). The peak current density on the Pd/GN catalyst for methanol oxidation was much larger than that of Pd/C catalyst in the alkaline conditions. When the loading amount of the Pd/GN catalyst was about 15.5 mu g/cm(2), the value of the oxidation peak current density reached 7.95 mA/cm(2). All the experimental results indicated that the Pd/GN catalyst significantly enhanced catalytic activity and stability than the commercial Pd/C catalyst.