The Synthesis and Catalytic Applications of Nanosized High‐Entropy Alloys

Abstract

Creative approaches towards the fabrication of metal nanomaterials for catalysis are highly demanded. In this context, integrating multiple elements into single nanosized alloys opens up a new route for tailoring catalytic performance. Particularly, nanosized high‐entropy alloys (HEAs) with five or more metallic components have emerged as a new platform for catalyst discovery in broad cases, such as ammonia decomposition, ammonia oxidation, and various electrochemical reactions. In this minireview, the vigorous current activity on the synthesis of HEAs nanoparticles (NPs) and their catalytic applications have been summarized. Theoretically, the rational design of heterogeneous HEAs catalysts has also been briefly discussed.

High-entropy materials for catalysis: A new frontier

“…Several recent papers have reviewed the catalytic applications mainly based on high-entropy alloys (HEAs), while entropy-stabilized systems beyond HEAs have been rarely covered (10)(11)(12)(13)(14)(15)(16). Elucidation of the structure-property relationships of HEMs, particularly across different subcategories, is crucial to leverage the enhanced entropic effects for catalysis.…”

Quinary, Senary, and Septenary High Entropy Alloy Nanoparticle Catalysts from Core@Shell Nanoparticles and the Significance of Intraparticle Heterogeneity

“…Then, in 2018, Yao et al reported discrete HEA nanoparticles (NPs) . These demonstrations inspire study of synthetic pathways to nanostructured HEAs as their complex compositions and crystal size effects may together bring distinct functionality. ,,− …”

“…High entropy alloys (HEAs) display distinct mechanical and functional properties. − They are commonly defined as single-phase materials consisting of five or more elements in nearly equal amounts, where entropic stabilization accounts for compositionally complex solid solution formation. In 2004, Yeh et al reported nanostructured HEAs .…”

Multi‐Sites Electrocatalysis in High‐Entropy Alloys

“…[19] iv) "Cocktail" effect refers to a kind of synergistic effect brought about by the interaction between various elements. [2,20] However, its specific physical meaning is not clear yet, and further explanation is needed from experiments and theory.…”