The Synthesis Of Pt-Ni Nanoparticles And The Exploration For Their Electrocatalytic Oxidation Reduction Properties

Platimum?Pt?is an effective catalyst in many significant application,especially in fuel cells.Although,Pt catalyst has well catalytic property for electrochemical reaction,unfortunately,the limited resource of Pt,expensive price and poor durability confine perform of Pt catalyst in fuel cells.However,lots of previous work suggest that Pt-M alloys?M=Ni,Co,Cu,etc.?have more positive catalytic property than pure Pt catalyst,and the Pt component of Pt-M alloys is fewer.Thus,creating new Pt-based catalyst has become a primary mission for fuel cell application during the past few decades.Pt-Ni nanocrystals have showed advantageous performance:in oxygen reduction reaction?ORR?and methanol oxidation reaction?MOR?among various bimetallic Pt-based alloys.All these make it of effectivity to overcome these existing problems,The major research contents are as follows:1.H₂PtC₁₆ and Ni?acac?₂ as precursors to synthesis composition-segregated octahedral Pt-Ni nanoparticle?CON?by one-pot solvothermal synthesis.After sonication?100 W?for 3h at 80?,the nanocrystals evolve to porous and open-structure which provide high atomic utilization by letting precious metal atoms of interior of nanocrystals participate in reaction.Furthermore,there are a lot of alloy-phase in the interior of nanocrystals that helps ORR activity enhanced.2.We have explored the growth process of CON and raised growth mechanism.Pt ions can be reduced preferentially because of higher standard reduction potential.The crystal growth is beginning with Pt-rich cuboctahedron,DMF and acetylacetonate could induce subsequent selective deposition let over growth process occur in<100>,and then hexapod-structure nanocrystal formed.CTA+ would induced second times selective deposition at concave of hexapod-structure nanocrystal.finally,Pt atoms migrate from Vertex to edge,duo to lower surface energy,the CONs formed.3.Two kinds of nanocrystals are synthesized and their growth principles of nanocrystals are analyzed.Agglomerated dendrites grow in the form of crystalline polymerization while spiny dendrites grow in the form of anisotropy.