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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
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Header DbId: enr
DbLabel: Energy & Power Source
An: 195362504
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Non‐Lattice Oxygen Triggered Deprotonation via Discontinuous Amorphous Interlayer on Supported IrO<subscript>x</subscript> for Acidic Oxygen Evolution.
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  Data: <searchLink fieldCode="AR" term="%22Fang%2C+Ping%22">Fang, Ping</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Yuxiang%22">Wang, Yuxiang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Zihou%22">Zhang, Zihou</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Fangce%22">Li, Fangce</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kong%2C+Lingchang%22">Kong, Lingchang</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Jingchao%22">Zhang, Jingchao</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Yanan%22">Chen, Yanan</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hu%2C+Wei%22">Hu, Wei</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chai%2C+Maorong%22">Chai, Maorong</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Fang%22">Zhang, Fang</searchLink><relatesTo>5</relatesTo> (AUTHOR)<i> fangzhang@bit.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Li%2C+Ailong%22">Li, Ailong</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> ailongli@ustc.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Li%2C+Yujing%22">Li, Yujing</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> yjli@bit.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Advanced+Energy+Materials%22">Advanced Energy Materials</searchLink>. 7/15/2026, Vol. 16 Issue 27, p1-13. 13p.
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: 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]
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        Value: 10.1002/aenm.71085
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        Text: English
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      – TitleFull: Non‐Lattice Oxygen Triggered Deprotonation via Discontinuous Amorphous Interlayer on Supported IrOx for Acidic Oxygen Evolution.
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              M: 07
              Text: 7/15/2026
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              Y: 2026
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