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Defect-Engineered IrOx@Perovskite Heterostructures via Thermal Reconstruction for Acid-Stable Oxygen Evolution

Junfang Cheng1, Xinyi Li1, Huimin Wang1

  • 1SJTU Paris Elite Institute of Technology, Shanghai Jiao Tong University, Shanghai, China.

Small (Weinheim an Der Bergstrasse, Germany)
|April 17, 2026
PubMed
Summary

Engineered IrOx-perovskite catalysts with controlled oxygen defects exhibit enhanced activity and stability for the acidic oxygen evolution reaction (OER). Thermal reconstruction improves catalyst performance by strengthening support interactions and promoting lattice oxygen participation.

Keywords:
LOM pathwayacidic OER catalystperovskite oxide catalystthermal reconstructioned oxygen defect regulation

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Perovskite oxides are promising supports for iridium-based (Ir) acidic oxygen evolution reaction (OER) catalysts.
  • Instability of these catalysts under harsh acidic conditions limits their practical application.
  • Defect engineering in IrOx-perovskite heterostructures presents a strategy to overcome these limitations.

Purpose of the Study:

  • To investigate thermal-reconstructed oxygen defect regulation in IrOx-perovskite heterostructures for acidic OER.
  • To enhance the activity and stability of Ir-based OER catalysts by creating defect-rich IrOx on a Ruddlesden-Popper perovskite support.

Main Methods:

  • Fabrication of IrOx@La1.2Sr0.8Ni0.6Fe0.4O4+δ (IrOx@LSNF) catalysts.
  • Controlled calcination at 250°C to induce in situ growth of oxygen-deficient amorphous IrOx.
  • Characterization of the resulting IrOx@LSNF-250 catalyst and evaluation of its OER performance in acidic media.

Main Results:

  • Thermal reconstruction at 250°C generated oxygen-defect-rich amorphous IrOx on LSNF, forming strong metal-metal oxides support interaction (MMSI).
  • The IrOx@LSNF-250 catalyst exhibited superior OER activity, attributed to enhanced active-site utilization and favored lattice oxygen participation mechanism (LOM).
  • The perovskite-anchored IrOx heterostructure demonstrated considerable durability in acidic media, mitigating LOM-induced collapse.

Conclusions:

  • Defect-engineered thermal reconstruction of IrOx-perovskite heterostructures effectively addresses the activity-stability trade-off in acidic OER.
  • The optimized IrOx@LSNF-250 catalyst shows potential for advanced acidic OER applications due to suppressed Ir dissolution and optimized LOM.
  • This work establishes a new paradigm for designing stable and active perovskite-based OER catalysts through defect engineering.