Preparation And Electrocatalytic Performance Of Low-content Noble Metal Multi-element Nanomaterial

Due to its unique d band structure,precious metal platinum（Pt）exhibits excellent electrocatalytic properties compared to other single metals.However,its scarcity of resources,slow catalytic kinetics,and poor resistance to carbon monoxide poisoning limit its large-scale application in electrocatalytic anode and cathode reactions.By alloying with cheap metals such as Cu and Co,not only can the amount of Pt be reduced,but also the ligand effect and strain effect between heteroatoms can adjust the d-band center of Pt,weaken the adsorption of intermediate species,and improve the catalyst activity.In this paper,a series of low platinum PtCuCo octahedral nanocatalysts were prepared by solvothermal method,and their oxygen reduction and alcohol oxidation properties were tested under acidic and alkaline conditions.The main research contents are as follows:1.A series of low platinum PtCuCo octahedral nanoalloys with ORR catalytic activity in both acidic and alkaline electrolytes were synthesized by solvothermal method.For ORR,the acidic/basic ORR mass activity of Pt_0.23Cu_0.64Co_0.13/C is14.3/10.7 times that of Pt/C,which is the best catalytic performance among PtCuCo nanoalloys.The mass activity of Pt_0.36Cu_0.39Co_0.25/C in acidic ORR was only 0.3 A mg _Pt^-1,but it reached 1.6 A mg _Pt^-1in alkaline ORR.The ORR catalytic performance of Pt_0.21Cu_0.41Co_0.38nanoalloy under acidic and alkaline conditions is not significantly different.The difference in ORR catalytic activity of PtCuCo nanoalloys stems from the different reaction mechanisms of oxygen reduction reactions in acidic and alkaline electrolytes,as well as the influence of different components of PtCuCo nanoalloys.Adjusting the atomic ratio of PtCuCo nanoalloys can change the electronic structure of their surfaces,thereby affecting their acidic and basic ORR catalytic activity and durability.2.PtCuCo nanoalloys have multifunctional catalytic activity,not only for ORR catalysis but also for methanol oxidation reaction（MOR）and ethanol oxidation reaction（EOR）.For MOR,the acidic/alkaline MOR mass activity of Pt_0.23Cu_0.64Co_0.13/C is 7.2/3.4 times that of Pt/C.For EOR,the acidic/alkaline EOR mass activity of Pt_0.23Cu_0.64Co_0.13/C is 7.5/2.8 times that of Pt/C.Pt_0.23Cu_0.64Co_0.13nanoalloy has significantly better catalytic performance and CO poisoning resistance than Pt/C in acidic and alkaline electrolytes.