High entropy alloy nanoparticles as oxygen electrocatalysts for metal-air batteries
Andreu Cabot a b
a Institut de Recerca en Energia de Catalunya (IREC), Jardins de les Dones de Negre 1, 2ª pl., Barcelona, Spain
b Institució Catalana de Recerca i Estudis Avançats (ICREA), Pg. Lluís Companys 23, E-08010 Barcelona, Spain
Proceedings of MATSUS Spring 2026 Conference (MATSUSSpring26)
C3 Compositionally Complex Nanocrystals: Synthesis and Application
Barcelona, Spain, 2026 March 23rd - 27th
Organizers: Ankita Bora and Suvodeep Sen
Invited Speaker, Andreu Cabot, presentation 688
Publication date: 15th December 2025

High-entropy alloys (HEAs) have emerged as a transformative platform for electrocatalysis. Their appeal lies in the vast compositional versatility enabled by the combination of five or more elements, which generates a rich diversity of atomic configurations and surface sites ideally suited for complex multistep reactions. Recent years have witnessed explosive growth in the development of HEMs across diverse material classes and their application to a wide range of electrochemical reactions. Yet significant challenges remain to fully harness their capabilities while managing their intrinsic structural and chemical complexity. Advancing the field requires exploring compositional space, pinpointing reaction sites, and achieving atomic-level control of surface composition and organization. In this presentation, I will describe our recent advances in the colloidal synthesis of HEA nanoparticles and demonstrate the potential of these materials as oxygen catalysts at the cathode of metal–air batteries, emphasizing opportunities to boost efficiency and stability using abundant-element compositions and rational high-entropy design.

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