High entropy alloys consist of equal or near equal amounts of five or more principal elements, being stabilized by their high entropy of mixing. Historically, high entropy alloys have been studied as structural materials, but with the development of synthetic pathways to high entropy alloy nanoparticles, their interest as catalysts has been growing. The direct colloidal synthesis of high entropy alloy nanoparticles is challenging given the different conditions under which various precursors must be reduced or decomposed. To address this challenge, we showed that core@shell nanoparticles can be synthesized first and then annealed at elevated temperatures to facilitate intermixing and the formation of the high entropy alloy phase. Here, the design of the precursor core@shell nanoparticles will be discussed, establishing that this nanocrystal conversion pathway is a general strategy to high entropy alloy nanoparticles. The catalytic performance of these nanocrystals will also be discussed as a function of composition for the oxygen reduction reaction, showing strong dependence on metal identity and degree of intermixing.

Conversion of core@shell nanoparticles to high entropy alloy nanoparticle catalysts

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