The Synthesis Of Pt And Pd Nanomaterials Using The Polyhedrin And Their Characterization

Platinum group metals have attracted much attention because of its unique physical and chemical properties. When their size is greatly reduced, the catalytic activity in various types of reactions will greatly enhance because of nano-size effect.The platinum group metal nanowire network has excellent catalytic activity, either as the anode or cathode catalyst material in the fuel cell. And the platinum group nanoparticles have high catalyst activities in the reaction of p-nitrophenol and other reactions of organic. The method that we used in this article is nonpoisonous, harmless,easy to operate and low energy consumption. The polyhedrin can be use as the stabilizer and the assistant reducing agent in the synthesis of nano-materials at a very low concentration. Some routine characterization of the samples had been texted.Methanol and ethanol electro-oxidation reactions had been used for the electrochemical catalytic activity text and tested nitrophenol reduction reaction for the organic catalytic activity. The reactivities are all higher than its corresponding commercial carbon carrier metal, the details are summarized as follows:1. The synthesis of Pt and Pd nanomaterials using the polyhedrin and their characterization.2. The synthesis platinum materials have higher electro-catalysis activity in an acidic environment, compared with the commercial Pt/C catalyst. The methanol oxidation peak current density of the platinum nanowire networks is 0.53 m A·cm-2,2.3 times higher than the commercial Pt/C catalyst. The onset potential for oxygen reduction reaction is positive of commercial Pt/C catalyst about 17 m V.3. The synthesis palladium materials have higher oxidation current density,slower decay rate and higher residual current density of both two reactions in an alkalin environment, compared with the commercial Pd/C. Especially the palladium nanowire networks have higher electro-catalysis activity.4. The Pd nano-materials had been attached to the carbon nano-tube, and tested nitrophenol reduction reaction. Whether the time of first reaction completed or theextent of lowered catalytic activity, Pd nanowire networks are larger than Pd nanoparticles. Thus palladium nanoparticles have high catalyst activities in the reaction of p-nitrophenol.