An incredible nanoporous alloy consisting of 14 major metals

A team of Japanese researchers has synthesized a high entropy alloy from 14 different elements in exactly equal proportions. A “cocktail effect” which gives it exceptional electrocatalytic properties.

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Its chemical formula is Al87AG1Feather1CO1Together1Fe1IR1MO1NS1PD1pt1Rahu1Are you1You1. A team of Japanese researchers has synthesized an alloy containing no less than 14 elements, namelyaluminumIPennies, l’or, take cobalt, ns Copper, ns DoingIiridium, molybdenum, Out, ns Durg, platinum, rhodium, ns kindness And this Titanium. this new Stuff belongs to the category of high entropy alloys, consisting of five or more elements in approximately equal proportions. Thanks to their extremely stable structure and their finely structured richness, these materials have exceptional mechanical properties From Resistance and firmness. Discovered suddenly in the 2000s, they have been the subject of much attention ever since and scientists are testing new “recipes” every day.

an original creation

interest of new 14 alloy metals Although its strength is less in favor of mechanical properties Catalyst. « Most conventional alloying catalysts consist of a primary metal component with a high atomic percentage, such as platinum, and one or two types of minor metal component with a relatively low atomic percentage.handjob clear guofeng wang, materials scientist at the University of Pittsburgh — who was not involved in the study. Minor components normally provide beneficial effects of ligands or deformation that improves the catalytic performance of the primary metal component “. But, with this new formula, more major and minor components, because all the elements are in proportion.” Thus we get millions of possible atomic arrangements Takeshi Fujita, a researcher at Kochi University of Technology and lead author of the journal study, says. chemical science. This deformation ability makes it possible to form many “hollows” that make the material very porous, one of the properties that is sought after. catalysis To produce an efficient filter – the larger the contact area, the faster the reaction.

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cocktail effect

However, the formation of alloys with more than 10 elements is very complex. ” like water and OilIt is not easy to mix many elements equally », explains Takeshi Fujita. So the researchers used a method called “desalloying,” which involves selectively corrosiveness of an element. 14 elements are mixed in a solution alkaline, which will degrade aluminum. Materials other than aluminum, insoluble, aggregates into one shape Solid with uniform distribution at the atomic level. Thus a nanoporous surface is approximately 5. obtained with holes of nanometer, which gives the alloy its exceptional catalytic properties. Fujita describes his new material as ” cocktail effect », a mixture of different metals modify their behavior. ” Cocktails are delicious not because of the sum of each of the ingredients, but because of the unexpected flavor of the combination of ingredients. », he shows. The advantage over conventional catalysts is that of course smaller amounts of rare and expensive metals such as platinum or palladium are required.

electrodes for the production of hydrogen

The team evaluated the alloy’s performance in the electrocatalysis reactionhydrogen Andoxygen this condition acid. The new alloy showed excellent electrochemical stability, rapid transportation of electrons and high speed. In addition, he morphology And its porous structure, even after spending ten hours in an acidic environment. This proves that it can be an excellent candidate for electrodes in water catalysis. A huge outlet, because it is neither more nor less generate hydrogen, presented as the fuel of the future.

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