Journal
SCIENCE
Volume 359, Issue 6383, Pages 1489-1494Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aan5412
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Funding
- National Science Foundation (NSF) [DMR-0959470]
- NSF [DMR-1620901, DMR-1410636]
- Department of Defense through the National Defense Science and Engineering Graduate Fellowship
- Office of Naval Research Multidisciplinary University Research Initiative grant
- Johns Hopkins University
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The controllable incorporation of multiple immiscible elements into a single nanoparticle merits untold scientific and technological potential, yet remains a challenge using conventional synthetic techniques. We present a general route for alloying up to eight dissimilar elements into single-phase solid-solution nanoparticles, referred to as high-entropy-alloy nanoparticles (HEA-NPs), by thermally shocking precursor metal salt mixtures loaded onto carbon supports [temperature similar to 2000 kelvin (K), 55-millisecond duration, rate of similar to 10(5) K per second]. We synthesized a wide range of multicomponent nanoparticles with a desired chemistry (composition), size, and phase (solid solution, phase-separated) by controlling the carbothermal shock (CTS) parameters (substrate, temperature, shock duration, and heating/cooling rate). To prove utility, we synthesized quinary HEA-NPs as ammonia oxidation catalysts with similar to 100% conversion and >99% nitrogen oxide selectivity over prolonged operations.
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