High-valent metal site incorporated heterointerface catalysts for high-performance anion-exchange membrane water electrolysers

Gwan Hyun Choi; N. Clament Sagaya Selvam; Hyunwoo Kim; Young Sang Park; Jiyoon Jung; Myeong Gyun Nam; Hyo Sang Jeon; Albert S. Lee; Won Sub Yoon; Pil J. Yoo

doi:10.1016/j.apcatb.2023.122816

High-valent metal site incorporated heterointerface catalysts for high-performance anion-exchange membrane water electrolysers

Gwan Hyun Choi
, N. Clament Sagaya Selvam
, Hyunwoo Kim
, Young Sang Park
, Jiyoon Jung
, Myeong Gyun Nam
, Hyo Sang Jeon
, Albert S. Lee
, Won Sub Yoon
, Pil J. Yoo

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

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 high-valent 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.

Original language	English
Article number	122816
Journal	Applied Catalysis B: Environmental
Volume	333
DOIs	https://doi.org/10.1016/j.apcatb.2023.122816
State	Published - 15 Sep 2023

Keywords

Anion-exchange membrane water electrolyser
Heterointerface catalysts
High-valent metal sites
Kirkendall effect
Oxygen evolution reaction

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10.1016/j.apcatb.2023.122816

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Choi, G. H., Clament Sagaya Selvam, N., Kim, H., Park, Y. S., Jung, J., Nam, M. G., Jeon, H. S., Lee, A. S., Yoon, W. S., & Yoo, P. J. (2023). High-valent metal site incorporated heterointerface catalysts for high-performance anion-exchange membrane water electrolysers. Applied Catalysis B: Environmental, 333, Article 122816. https://doi.org/10.1016/j.apcatb.2023.122816

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title = "High-valent metal site incorporated heterointerface catalysts for high-performance anion-exchange membrane water electrolysers",

abstract = "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 high-valent 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.",

keywords = "Anion-exchange membrane water electrolyser, Heterointerface catalysts, High-valent metal sites, Kirkendall effect, Oxygen evolution reaction",

author = "Choi, \{Gwan Hyun\} and \{Clament Sagaya Selvam\}, N. and Hyunwoo Kim and Park, \{Young Sang\} and Jiyoon Jung and Nam, \{Myeong Gyun\} and Jeon, \{Hyo Sang\} and Lee, \{Albert S.\} and Yoon, \{Won Sub\} and Yoo, \{Pil J.\}",

note = "Publisher Copyright: {\textcopyright} 2023 Elsevier B.V.",

year = "2023",

month = sep,

day = "15",

doi = "10.1016/j.apcatb.2023.122816",

language = "English",

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journal = "Applied Catalysis B: Environmental",

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T1 - High-valent metal site incorporated heterointerface catalysts for high-performance anion-exchange membrane water electrolysers

AU - Choi, Gwan Hyun

AU - Clament Sagaya Selvam, N.

AU - Kim, Hyunwoo

AU - Park, Young Sang

AU - Jung, Jiyoon

AU - Nam, Myeong Gyun

AU - Jeon, Hyo Sang

AU - Lee, Albert S.

AU - Yoon, Won Sub

AU - Yoo, Pil J.

PY - 2023/9/15

Y1 - 2023/9/15

N2 - 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 high-valent 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.

AB - 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 high-valent 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.

KW - Anion-exchange membrane water electrolyser

KW - Heterointerface catalysts

KW - High-valent metal sites

KW - Kirkendall effect

KW - Oxygen evolution reaction

UR - https://www.scopus.com/pages/publications/85153623993

U2 - 10.1016/j.apcatb.2023.122816

DO - 10.1016/j.apcatb.2023.122816

M3 - Article

AN - SCOPUS:85153623993

SN - 0926-3373

VL - 333

JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

M1 - 122816

ER -

High-valent metal site incorporated heterointerface catalysts for high-performance anion-exchange membrane water electrolysers

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