Choi, Gwan Hyun Selvam, N. Clament Sagaya Kim, Hyunwoo Park, Young Sang Jung, Jiyoon Gyun, Myeong Jeon, Hyo Sang Lee, Albert S. Yoon, Won-Sub Yoo, Pil J. 2024-01-19T08:34:19Z 2024-01-19T08:34:19Z 2023-09-07 2023-09 0926-3373 https://pubs.kist.re.kr/handle/201004/113318 The design of heterointerface-structured catalysts with tunable active sites is critical to address the activity and durability challenges of water oxidation process. In this study, a novel interfacial engineering strategy based on the anionic diffusion-limited Kirkendall effect (KE) was employed for the synthesis of a FeCo/FeCoP with highvalent Fe (Fe+3.18) sites. Specifically, a model system of the FeCo/FeCoP heterointerface was obtained through the phosphidation of carbon-encapsulated FeCo nanoparticles. The highly efficient and stable oxygen evolution reaction (OER) performance of the FeCo/FeCoP catalyst was demonstrated in an anion-exchange membrane water electrolyser (12.26 A cm-2 at 2.0 V). Through density functional theory calculations, the high-valent Fe sites in the FeCo/FeCoP heterointerface were found to balance the adsorption energetics of the OER intermediates. The structure-oxidation state-OER activity correlation of the FeCo/FeCoP catalysts demonstrated herein emphasises the significance of understanding the water oxidation chemistry of heterointerface-structured catalysts for their potential applications in different energy conversion devices. English Elsevier BV High-valent metal site incorporated heterointerface catalysts for high-performance anion-exchange membrane water electrolysers Article 10.1016/j.apcatb.2023.122816 1 Applied Catalysis B: Environmental, v.333 Applied Catalysis B: Environmental 333 N scie scopus 001053517900001 2-s2.0-85153623993 Chemistry, Physical Engineering, Environmental Engineering, Chemical Chemistry Engineering Article OXYGEN EVOLUTION REACTION FE-SITES OXIDATION ELECTROCATALYSIS NANOCRYSTALS DIFFUSION DESIGN NIFE Heterointerface catalysts High -valent metal sites Kirkendall effect Oxygen evolution reaction Anion -exchange membrane water electrolyser