High entropy alloys are alloys that form by mixing equal or near equal amounts of five or more principal elements, being stabilized by their high entropy of mixing. Recently, we reported a nanocrystal conversion approach to high entropy alloy nanoparticles where in core@shell nanoparticles are first prepared by seed-mediated co-reduction and then thermally annealed to facilitate intermixing and the formation of the high entropy phase. Attractive features of this synthetic approach is that the monodispersity of the initial seeds are transferred to the final high entropy phase and the synthesis of core@shell nanoparticles is more straightforward than direct synthesis of high entropy alloy nanoparticles via colloidal methods. However, we have identified in some cases that uniform mixing at the atomic scale is not achieved and that there are insufficient analytical tools to ensure uniform mixing. Yet, our results show that the catalytic performance of high entropy alloy nanoparticles depends directly on the degree of mixing or intraparticle heterogeneity.

On the impact of intraparticle heterogeneity in high entropy alloy nanoparticle catalysts

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