Stractlable Preparation And Electrocatalytic Performance Of Low Platinum Multicomponent Alloy Nanotubes

The structure of open one-dimensional(ID)nanotubes(NTs)structure has the advantages of preventing agglomeration,not easy to dissolve,many active sites,no carrier,and strong stability.In terms of composition,alloying with transition metals to prepare low-platinum catalysts are currently the more mainstream design ideas.Combining these points of view,we have introduced copper,palladium,and gold elements and combined open-structure self-supporting alloy nanotube structures to produce a catalyst with excellent properties.In this paper,copper nanowires were prepared by the liquid-phase chemical reduction method as sacrificial templates.Two different ternary alloy catalysts,CuPtPd and CuPtAu,were prepared via galvanic replacement reaction,and studied their their electrocatalytic properties.First,find the optimal reaction conditions for preparing CuPtPd ternary alloy nanotubes.After determining the reaction parameters and changing the corresponding salt solution addition amounts,copper platinum-palladium alloy nanotubes with different alloy ratios were prepared.The alloy nanotubes have an outer diameter of 150 nm to 200 nm,a length of one micrometer to three micrometers,and a wall thickness of about 20 nm to 30 nm.The tube has a relatively complete structure and consists of small particles.The oxygen reduction performance of alloy nanotubes was also investigated.The oxygen reduction performances of Pt33Cu54Pdl3 and Pt37Cu41Au22 were found to be very good,with the starting potential exceeding commercial Pt/C50mV and 40mV,respectively.The kinetic current density is also greater than commercial Pt/C.And the methanol oxidation performance of the alloy has been improved,the ability of anti-CO poisoning is significantly higher than Pt/C.The effects of low-platinum multi-element alloy nanotubes on the oxidation of methanol and the reduction of CO2 were discussed.It was found that the components of the alloy nanotubes have a significant effect on the above-mentioned electrocatalytic performance.Among them,Pt25Cu44Pd31 has the best CO2 reduction performance;Pt37Cu41Au22 has the best electrocatalytic performance for methanol oxidation.The above-mentioned metal alloy catalyst is reduced by a simple liquid-phase chemical reduction method using sodium borohydride ethanol solution to remove oxides from the catalyst,and then the electrocatalytic performance is studied.It was found that the oxygen reduction performances of the two catalysts Pt25Cu44Pd31 and Pt37Cu32Au31 were greatly improved and the methanol oxidation performance was decreased.