High-Entropy Nanomaterials for Advanced Electrocatalysis.

High-entropy alloys refer to near-equimolar alloys of five or more elements and are receiving attention due to their unique physical and chemical properties. In electrocatalysis, they serve as active sites in multiple elements, favoring the optimized adsorption/desorption property toward the target reaction. High-entropy nanomaterials (HENMs) are attractive candidates as electrocatalysts by taking advantage of a high surface-to-volume ratio and tailored composition. This review begins with the concept of high-entropy materials and various strategies for designing electrocatalysts. Then, the recent advances in HENMs as electrocatalysts for various applications (water-splitting reaction, carbon dioxide reduction reaction, alcohol oxidation reaction, etc.) are introduced with their catalytic performances. Finally, based on the current status of HENMs for electrocatalysis, the challenging aspects and the future insight of HENMs for advanced electrocatalysis are discussed and proposed.