Stabilising the Lattice Oxygen Oxidation Mechanism Through Iridium Single Atoms in Chromium‐Doped Cobalt Iron Layered Double Hydroxides
7 affiliations
- 1School of Chemical Engineering University of New South Wales UNSW Sydney Sydney New South Wales Australia
- 2School of Chemical Engineering Adelaide University Adelaide South Australia Australia
- 3Centre For Clean Energy Technology University of Technology Sydney Broadway New South Wales Australia
- 4Engineering Research Center For Nanomaterials Henan University Kaifeng People's Republic of China
- 5Australian Synchrotron‐ANSTO Clayton, Victory Australia
- 6Electron Microscope Unit Mark Wainwright Analytical Centre UNSW Sydney Sydney New South Wales Australia
- 7School of Materials Science and Engineering UNSW Sydney Sydney New South Wales Australia
Abstract
Transition metal hydroxides are among the most promising alkaline oxygen evolution reaction (OER) catalysts for anion exchange membrane water electrolysers (AEMWEs), owing to their high intrinsic activity originated from the kinetically favourable lattice oxygen oxidation mechanism (LOM). However, lattice oxygen participation often accelerates catalyst degradation through active‐site dissolution, posing a major challenge to the long‐term stability. Herein, we report a synergistic catalyst design that simultaneously promotes efficient LOM and improves durability through incorporating Ir single atoms (IrSAs) and Cr doping into CoFe layered double hydroxide (LDH). The resulting IrSAs/CoFeCr LDH exhibits low overpotential of 252 mV at 10 mA cm−2 and maintains stable operation for over 100 h at 500 mA cm−2. Combined experimental and theoretical analyses reveal that Ir and Co serve as primary OER‐active sites, while Cr enhances the structural stability by enriching the electron density of neighbouring metal sites. This electronic modulation suppresses over‐oxidation and facilitates lattice oxygen regeneration, while Ir incorporation strengthens the metal‐oxygen covalency, enabling reversible lattice‐oxygen participation. The AEMWE exhibits a low cell voltage of 1.61 V at 1 A cm−2 and durability over 120 h with a negligible decay rate of 0.04 mV h−1, highlighting the practical viability of the catalyst design for alkaline water electrolysis.
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BibTeX
@article{eskandari2026stabilising,
title = {{Stabilising the Lattice Oxygen Oxidation Mechanism Through Iridium Single Atoms in Chromium‐Doped Cobalt Iron Layered Double Hydroxides}},
author = {Parisa Eskandari and Shujie Zhou and Jodie Yuwono and Yufei Zhao and Hanyu Xu and Zhihong Tian and Jingwen Ba and Ming Zhang and Bernt Johannessen and Thanh Son Bui and Richard F. Webster and Jing Chu and Xunyu Lu and Rose Amal},
journal = {Advanced Science},
year = {2026},
month = aug,
doi = {10.1002/advs.77198},
url = {https://doi.org/10.1002/advs.77198},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Stabilising the Lattice Oxygen Oxidation Mechanism Through Iridium Single Atoms in Chromium‐Doped Cobalt Iron Layered Double Hydroxides
AU - Parisa Eskandari
AU - Shujie Zhou
AU - Jodie Yuwono
AU - Yufei Zhao
AU - Hanyu Xu
AU - Zhihong Tian
AU - Jingwen Ba
AU - Ming Zhang
AU - Bernt Johannessen
AU - Thanh Son Bui
AU - Richard F. Webster
AU - Jing Chu
AU - Xunyu Lu
AU - Rose Amal
PY - 2026
DA - 2026/08/14
JO - Advanced Science
DO - 10.1002/advs.77198
UR - https://doi.org/10.1002/advs.77198
AB - Transition metal hydroxides are among the most promising alkaline oxygen evolution reaction (OER) catalysts for anion exchange membrane water electrolysers (AEMWEs), owing to their high intrinsic activity originated from the kinetically favourable lattice oxygen oxidation mechanism (LOM). However, lattice oxygen participation often accelerates catalyst degradation through active‐site dissolution, posing a major challenge to the long‐term stability. Herein, we report a synergistic catalyst design that simultaneously promotes efficient LOM and improves durability through incorporating Ir single atoms (IrSAs) and Cr doping into CoFe layered double hydroxide (LDH). The resulting IrSAs/CoFeCr LDH exhibits low overpotential of 252 mV at 10 mA cm−2 and maintains stable operation for over 100 h at 500 mA cm−2. Combined experimental and theoretical analyses reveal that Ir and Co serve as primary OER‐active sites, while Cr enhances the structural stability by enriching the electron density of neighbouring metal sites. This electronic modulation suppresses over‐oxidation and facilitates lattice oxygen regeneration, while Ir incorporation strengthens the metal‐oxygen covalency, enabling reversible lattice‐oxygen participation. The AEMWE exhibits a low cell voltage of 1.61 V at 1 A cm−2 and durability over 120 h with a negligible decay rate of 0.04 mV h−1, highlighting the practical viability of the catalyst design for alkaline water electrolysis.
SN - 2198-3844
ER -