Study Of Synthesis Of Pt、Pd/Graphene Composite Electrocatalysts And Its Properties

It has been found that the composite of metal and oxide is one of the important methods to improve the performance of the material in many applications including materials science, microelectronics, and chemical applications. Interactions between metals and oxides are key factors to determine the performance of metal/oxide heterojunctions. In this paper, a series of noble-metal/oxide/graphene nanocomposites have been synthesized by regulating action of inorganic electrolytes and hydrorhermal method. The electrochemical properties of nanocomposites for formic acid and methanol oxidation have also been investigated. The main conclusions are listed as follows:1、By using hydrorhermal and forced hydrolysis as methods of material synthesis, CuONPs, Fe3O4NPs, PtNPs, PdNPs and Fe2O3NPs were syntheaized. The samples are characterized by UV-Vis, TEM and SEM.2、CuONPs, Fe3O4NPs and a series of Fe2O3NPs were loaded onto graphene oxide(GO). And then the electrocatalytic activities of those oxide/graphene composites for formic acid and methanol methanol oxidation was examined. The result revealed that oxide/graphene catalysts almost no catalytic effect.3、A series of noble metal/oxide/graphene nanocomposites have been synthesized by regulating action of inorganic electrolytes method, and the composite materials are characterized by TEM and SEM. The electrocatalytic activities of those noble-metal/oxide/graphene composites for formic acid and methanol methanol oxidation was examined and the mechanism of electrocatalytic activities in small molecular organ by electrocatalytic oxidation is primarily explored. Research results show that noble-metal/oxide/graphene catalysts exhibited a better activity and stability than did the unmodified noble-metal/grapheme. The contact can confine these coordinatively unsaturated (CUS) cations by strong metal-oxides interaction and show high catalytic capacity on the preferential oxidation of carbon monoxides. It is reflected in the improvement of anti-poisoning of CO performance of catalytic in the noble metal catalytic domain. The fact was ascribed to the synergistic effect between noble-metal and oxide. Interactions between metals and oxides can be one of the key factors in the synergistic effect.4、A series of Pt-Fe2O3/RGO catalysts with different morphology of Fe2O3NPs were prepared by hydrorhermal method and these composite materials are characterized by TEM and SEM. The electrocatalytic activities of those Pt-Fe2O3/RGO catalysts for formic acid and methanol methanol oxidation and the influence of the nature of Fe2O3NPs on the catalytic activity of Pt-Fe2O3/RGO catalysts for direct methanol fuel cells was investigated. Catalytic reaction experiments on the supported Pt-Fe2O3/RGO catalysts with different morphology of Fe2O3NPs prepared by a reproducible synthesis method shows that the identified ensemble is highly active, selective, and robust for CO oxidation, and the performance is very useful for many catalytic reactions. Finally, the result shows that the Fe2O3 prepared by different methods can affect the tolerance to the intermediate carbonaceous species and the Pt-Fe2O3-sp/RGO(1:0.5) shows the best active, selective, and tolerance to the intermediate carbonaceous species (CO) for methanol electro-oxidation.