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Non‐Lattice Oxygen Triggered Deprotonation via Discontinuous Amorphous Interlayer on Supported IrOx for Acidic Oxygen Evolution.

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Title:	Non‐Lattice Oxygen Triggered Deprotonation via Discontinuous Amorphous Interlayer on Supported IrOx for Acidic Oxygen Evolution.
Authors:	Fang, Ping¹ (AUTHOR), Wang, Yuxiang¹ (AUTHOR), Zhang, Zihou¹ (AUTHOR), Li, Fangce¹ (AUTHOR), Kong, Lingchang² (AUTHOR), Zhang, Jingchao² (AUTHOR), Chen, Yanan² (AUTHOR), Hu, Wei³ (AUTHOR), Chai, Maorong⁴ (AUTHOR), Zhang, Fang⁵ (AUTHOR) fangzhang@bit.edu.cn, Li, Ailong³ (AUTHOR) ailongli@ustc.edu.cn, Li, Yujing¹ (AUTHOR) yjli@bit.edu.cn
Source:	Advanced Energy Materials. 7/15/2026, Vol. 16 Issue 27, p1-13. 13p.
Abstract:	Iridium‐based catalysts for the acidic oxygen evolution reaction (OER) predominantly follow the adsorbate evolution mechanism (AEM), with their intrinsic activity limited by sluggish proton‐transfer kinetics. Based on this, a strategy is proposed involving the construction of a discontinuous WOx interlayer incorporating isolated W single atoms and amorphous WOx clusters on supported Ir‐based catalysts. The optimized Ir/W‐TiN catalyst achieves current densities of 100 mA cm−2 at remarkably low overpotentials of 293 mV. Leveraging the non‐lattice oxygen from the amorphous WOx, this design promotes a shift in the reaction pathway from the conventional AEM to an interface non‐lattice oxygen‐assisted deprotonation mechanism (IOADM), simultaneously enhancing both activity and stability. The incorporation of W species facilitates the formation of oxygen vacancies and a hydrogen‐bond network, which lowers the reaction energy barrier and accelerates deprotonation kinetics. In a proton exchange membrane water electrolyzer, the membrane electrode assembly with the Ir/W‐TiN anode exhibits a high current density exceeding 2.2 A cm−2 at 1.8 V. Furthermore, with a low Ir loading of 0.2 mgIr cm−2, it demonstrates excellent durability, maintaining stable operation for 2000 h at 1.0 A cm−2. This work provides new mechanistic insights for designing highly efficient, stable, and low‐Ir‐loaded anode catalysts via interface engineering. [ABSTRACT FROM AUTHOR]
Database:	Energy & Power Source

Description
Abstract:	Iridium‐based catalysts for the acidic oxygen evolution reaction (OER) predominantly follow the adsorbate evolution mechanism (AEM), with their intrinsic activity limited by sluggish proton‐transfer kinetics. Based on this, a strategy is proposed involving the construction of a discontinuous WOx interlayer incorporating isolated W single atoms and amorphous WOx clusters on supported Ir‐based catalysts. The optimized Ir/W‐TiN catalyst achieves current densities of 100 mA cm−2 at remarkably low overpotentials of 293 mV. Leveraging the non‐lattice oxygen from the amorphous WOx, this design promotes a shift in the reaction pathway from the conventional AEM to an interface non‐lattice oxygen‐assisted deprotonation mechanism (IOADM), simultaneously enhancing both activity and stability. The incorporation of W species facilitates the formation of oxygen vacancies and a hydrogen‐bond network, which lowers the reaction energy barrier and accelerates deprotonation kinetics. In a proton exchange membrane water electrolyzer, the membrane electrode assembly with the Ir/W‐TiN anode exhibits a high current density exceeding 2.2 A cm−2 at 1.8 V. Furthermore, with a low Ir loading of 0.2 mgIr cm−2, it demonstrates excellent durability, maintaining stable operation for 2000 h at 1.0 A cm−2. This work provides new mechanistic insights for designing highly efficient, stable, and low‐Ir‐loaded anode catalysts via interface engineering. [ABSTRACT FROM AUTHOR]
ISSN:	16146832
DOI:	10.1002/aenm.71085