Kinetically-controlled laser-synthesis of colloidal high-entropy alloy nanoparticles

The single-step incorporation of multiple immiscible elements into colloidal high-entropy alloy (HEA) nanoparticles has manifold technological potential, but it continues to be a challenge for state-of-the-art synthesis methods. Hence, the development of a synthesis approach by which the chemical co...

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Bibliographic Details
Published in:RSC advances 2019-06, Vol.9 (32), p.18547-18558
Main Authors: Waag, Friedrich, Li, Yao, Ziefuß, Anna Rosa, Bertin, Erwan, Kamp, Marius, Duppel, Viola, Marzun, Galina, Kienle, Lorenz, Barcikowski, Stephan, Gökce, Bilal
Format: Article
Language:English
Subjects:
Chemical composition
Chemical synthesis
Chemistry
Colloid chemistry
Colloiding
Electrochemical analysis
Heat treatment
High entropy alloys
Laser ablation
Liquid phases
Nanoalloys
Nanoparticles
Organic chemistry
Oxygen evolution reactions
Pulsed lasers
State of the art
Stoichiometry
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Summary:The single-step incorporation of multiple immiscible elements into colloidal high-entropy alloy (HEA) nanoparticles has manifold technological potential, but it continues to be a challenge for state-of-the-art synthesis methods. Hence, the development of a synthesis approach by which the chemical composition and phase of colloidal HEA nanoparticles can be controlled could lead to a new pool of nanoalloys with unparalleled functionalities. Herein, this study reports the single-step synthesis of colloidal CoCrFeMnNi HEA nanoparticles with targeted equimolar stoichiometry and diameters less than 5 nm by liquid-phase, ultrashort-pulsed laser ablation of the consolidated and heat-treated micropowders of the five constituent metals. Further, the scalability of the process with an unprecedented productivity of 3 grams of colloidal HEA nanoparticles per hour is demonstrated. Electrochemical analysis reveals a unique redox behavior of the particles' surfaces in an alkaline environment and a potential for future application as a heterogeneous catalyst for the oxygen evolution reaction. The laser ablation of a bulk CoCrFeMnNi high-entropy alloy immersed in liquid yields colloidal nanoparticles with diameters below 5 nm. Both, the chemical composition and the crystal lattice of the bulk material is preserved in the nanoparticles.
ISSN:2046-2069
2046-2069
DOI:10.1039/c9ra03254a