Investigating the Chemical and Electronic Structures of ABO3-type High-Entropy Oxides for Electrochemical Oxygen Evolution Reaction (2025)
Abstract
In this study, we present a novel synthesis method for ABO3-type high-entropy oxide (HEO) catalysts and explore their critical role in the electrochemical oxygen evolution reaction (OER). Using a two-step approach, we synthesized La(Mn0.2Fe0.2Co0.2Ni0.2Cu0.2)O3 HEO catalysts, employing different complexing agents followed by calcination. These catalysts exhibit significantly reduced overpotentials at high current densities while maintaining excellent stability. Our findings highlight the importance of the coordination structure and interactions among metal elements in high-entropy systems for achieving superior activity and durability. To further elucidate these structure-activity relationships, we aim to perform an in-depth analysis using MEX-1 beamline.
