Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 333, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2023.122816
Keywords
Heterointerface catalysts; High -valent metal sites; Kirkendall effect; Oxygen evolution reaction; Anion -exchange membrane water electrolyser
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The study demonstrates the design of heterointerface-structured catalysts with tunable active sites using an interfacial engineering strategy based on the anionic diffusion-limited Kirkendall effect. A FeCo/FeCoP catalyst with highvalent Fe sites was successfully synthesized through the phosphidation of carbon-encapsulated FeCo nanoparticles. The FeCo/FeCoP catalyst exhibited highly efficient and stable oxygen evolution reaction performance, highlighting the importance of understanding the water oxidation chemistry of heterointerface-structured catalysts for potential energy conversion applications.
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.
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