Authors
Parisa Eskandari, Shujie Zhou, Jodie Yuwono, Yufei Zhao, Hanyu Xu, Zhihong Tian, Jingwen Ba, Ming Zhang, Bernt Johannessen, Thanh Son Bui, Richard F Webster, Jing Chu, Xunyu Lu, Rose Amal
Published in
Advanced science (Weinheim, Baden-Wurttemberg, Germany). Pages e77198. Aug 14, 2026. Epub Aug 14, 2026.
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.
PMID:
42598781
Bibliographic data and abstract were imported from PubMed on 14 Aug 2026.
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