Electrocatalytic Properties Of Nano-porous High Entropy Alloys With Low Noble Metal Content

With the giant progress and rapid development of modern society,people's demand of energy is growing and the demand for energy from all walks of life is also increasing.However,with the increasing of environmental pollution and energy crisis,the traditional way to obtain energy were not efficient enough to meet the needs of human beings.Therefore,many researchers are looking for clean and renewable energy,such as solar energy,biomass energy,wind energy.However,these renewable energy sources also have some unstable,intermittent and regional problems.In order to solve this problem,many new energy generation devices has been developed to achieve environmentally friendly goals,such as fuel cells and metal-air batteries.This project mainly studies the electrocatalysis stage of battery and its application in actual production.However,the selection of catalyst has always limited the key factors of battery and metal air battery performance.Because the catalytic performance of noble metal is good,but its crust content is small and the cost is very high,so how to design and manufacture catalyst with outstanding performance,less noble metal content and good stability is appropriate the focus of this study.In this paper,through a top-down preparation method,the components of high entropy alloy are designed,and the designed metal elements are melted in a micro metal melting furnace,and then the metal alloy strips are obtained by high-speed melting and slitting,and then the active matrix metal aluminum in the alloy strips is removed by alkaline solution,so as to obtain nano porous high entropy alloy.The high entropy alloy prepared by this method is stable,simple,convenient and easy to operate and copy.In the project,the high entropy alloy containing noble metal Ir was designed,and the five elements alloy Al₉₆Ni₁Co₁Ir₁X₁(X:Mo/Cr/Cu/Nb/V)was obtained.In addition,quaternary Al₉₇Ni₁Co₁Ir₁ and ternary alloy Al₉₆Ni₂Ir₂ were designed as comparative experiments.The element composition of high entropy alloy was confirmed by the later characterization experiment,which met the expectation.Through the performance test of five element alloy,it was found that its catalytic performance in acid solution was especially outstanding.The ratio with the best performance is not only superior to the catalytic performance of HER,OER and overall-water splitting in most domestic and foreign references,but also has excellent stability,demonstrating excellent practical application value.Then,other high entropy alloy catalysts containing noble metals were explored.The element composition of Al₉₆Ni₁Co₁Ru₁X₁(X:Mo/Cu/Fe/V)and four components of Al₉₇Ni₁Co₁Ru₁ and Al₉₆Ni₂Ru₂ were designed.Due to the difference between the properties of Ru and Ir,this electrochemical test mainly focused on the investigation of the three functions of the catalyst in alkaline solution It has a very beautiful nanowire porous structure,which makes it have more catalytic active sites and larger electrochemical active area,which is conducive to the catalytic reaction.The test results are in line with expectations.The best performance of the high entropy alloy ratio has excellent three functions.The water battery and solid zinc air battery are further assembled.In the actual test,the open circuit voltage,power density and energy density are higher than most of the research results,and the stable cycle time is longer than most reported results.