High-throughput Synthesis And Screening Of Alloy Catalysts For Hydrogen Evolution

Hydrogen is not only an efficient clean energy,but also an indispensable chemical.With the reduction of electricity cost,the preparation of hydrogen from water by electrolysis technology has attracted people's attention.The key is to obtain efficient,inexpensive and stable hydrogen evolution catalytic materials.The hydrogen evolution catalytic material represented by the Pt-based alloy has good performance,but its cost and component scarcity severely limit its application.Although the performance of the unit non-precious metal catalyst is poor,the performance of the binary alloy catalyst is improved.The development of non-precious metal alloy hydrogen evolution catalysts has become the focus of research.In order to accelerate the related research and development process,this paper proposes a high-throughput screening of electrocatalyst materials by combining magnetron sputtering preparation technology with scanning electrochemical microscopy characterization technology.The feasibility of the scheme was demonstrated by Cu-Co-Ni ternary alloy.Thesis research has achieved the following results:(1)An effective method for characterizing the electrocatalytic hydrogen evolution of thin film materials by scanning electrochemical micro-domain testing was established.Through the feedback mode test of the thin film micro-region,the feedback current of the probe tip is used as an indicator of the catalytic performance of the micro-domain component.A reasonable probe potential for the hydrogen evolution performance of the reaction substrate electrode was analyzed.Due to the change of probe composition,the feedback current increases first and then decreases with the increase of probe potential in 0.01 mol/L H2SO4+0.1 mol/L Na2SO4 solution.When the probe potential is 0.4 V(vs Ag/AgCl)The feedback current is maximum.In a 0.5 mol/L NaOH alkaline aqueous solution,the feedback current is maximum when the probe potential is-0.2 V(vs Ag/AgCl).(2)The alloy film material library with continuously changing composition was prepared on the substrate by vacuum magnetron sputtering technology,which achieved the goal of high-throughput preparation.At a sputtering power of 100 W,the sputtering rate of Cu is greater than that of Co and Ni,wherein the average sputtering rate of Cu is 29 nm/min,and the sputtering rates of Co and Ni are equivalent,with an average of 17 nm/min.(3)The high-throughput characterization of Cu-Co-Ni ternary alloy film material library was carried out by the micro-area electrocatalytic characterization scheme established in this paper.It is found that the catalytic performance of the ternary region of Cu-Co-Ni film is significantly higher than that of the binary region.Among them,the performance of single component is the worst,and the performance of Cu0.33Co0.14Ni0.53 ternary alloy is the best,and the feedback current can reach 6700 nA.