Preparation And Properties Of Bimetallic Nanocrystals

Fuel cell,which can conver chemical energy to electrical energy efficiently and has other advantages,effectively solved the current energy crisis and has been received attention.The activity of the electrocatalyst is directly related to the performance of the fuel cell.Among them,the noble metal catalyst is widely used in fuel cells and has excellent performance,such as commonly used platinum-based nano-materials.However,the storage capacity of noble metal platinum is limited and the price is high,and prone to CO poisoning and other phenomena,which have great effects on the application and development of the fuel cell.Therefore,it has practical significance to improve the catalytic performance of noble metal nanomaterials about the development and application of fuel cells.Herein,we mainly research the preparation of bimetallic nanocatalysts with high catalytic activity and its electrochemical performance were studied.The main research detail are as follows:1?Preparation of Pd-Pt alloy nanocrystals and their electrocatalytic properties for formic acid oxiditionIn this work,the palladium-platinum alloy nanocrystals were prepared by a one-step hydrothermal method using fructose as a reductant,which was non-toxic and weakly reducing.The mechanism of formic acid oxidation was also discussed.When the ratio of Pd/Pt was 1: 3,the electrocatalytic activity of Pd-Pt alloy nanocrystals for formic acid oxidation was the best,and the mass ratio activity was 2.1 times of the commercial Pt black.2 ? One-pot fabrication of single-crystalline octahedral Pd-Pt nanocrystals and their electrocatalytic activity for methanol oxidationThis study reports the preparation of Pd-Pt bimetallic nanocrystals through a facile,one-pot,templateless,and seedless hydrothermal method.The morphology,composition,and structure of Pd-Pt nanocrystals are fully characterised by various physical techniques,thereby demonstrating the highly alloying,octahedral nanostructures of the nanocrystals.The formation or growth mechanism of Pd-Pt bimetallic alloy nanocrystals is explored and discussed based on the experimental observations.In addition,the synthesised Pd-Pt nanocrystals was studied about methanol oxidation reaction in alkaline media.Pd1Pt3 exhibits the best durability and its mass activity is 3.4 and 5.2 times greater than those of Pt black and Pd black catalysts,respectively.3?Surfactant-Free,Green Synthesis of PdPt Nanodendrites on Reduced Graphene Oxide for the Alkaline Ethanol Oxidation ReactionIn this article,a green method,in which no surfactants or stabilizing agents are required,for the synthesis of residue-free PdPt nanodendrites on reduced graphene oxide is reported.Using UV light as an energy trigger and methanol as the reducing agent,PdPt nanodendrites are synthesised with clean,residue-free surfaces without any additives.Of the nanodendrite composites prepared,those containing a Pd:Pt ratio of 1:2 on reduced graphene oxide exhibit the best stability and durability,and their mass activity is 2.0 and 2.4 times greater than those of commercial Pt/C and Pd/C catalysts,respectively.