Recent advances in high-entropy intermetallic nanoparticles: synthesis and electrocatalytic applications.

High-entropy intermetallics (HEIs) are a novel class of materials that combine the ordered atomic structure of traditional intermetallic compounds with the compositional complexity of high-entropy alloys. This unique combination endows HEIs with exceptional stability and tunable electronic structures, making them promising candidates for advanced catalytic applications. Currently, most reports on HEIs focus on bulk materials, studies on HEI nanoparticles (NPs) remain relatively limited. This review provides an overview of the recent advances in HEI NPs, including their synthesis methods and applications in electrochemical catalysis. First, we introduce the key characteristics of HEIs, focusing on their unique combination of ordered atomic structure and compositional complexity. We then summarise the synthesis methods for HEI NPs reported in recent years. Finally, representative examples are provided to illustrate the application of HEI NPs in electrochemical catalytic reactions such as hydrogen evolution, formic acid oxidation, and oxygen reduction reactions. This review aims to offer insights into the future directions of HEI and promote innovation in both synthesis methods and practical applications of HEI NPs.