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Updated: May 17, 2025
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Complex Iridate Solid Solutions for Catalyzing Oxygen Evolution Reaction: Comparison of Elemental Leaching and
Ki Hyun Park1, Younghwan Lim1, Hyung Bin Bae2
1Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea.
Journal of the American Chemical Society
|May 16, 2025
Summary
This study introduces a new method for creating stable iridium-based solid-solution oxides for oxygen evolution reactions (OER). These novel catalysts show high performance and reduce reliance on iridium, paving the way for efficient acidic water oxidation.
Area of Science:
- Materials Science
- Electrochemistry
- Inorganic Chemistry
Background:
- Forming solid solutions of rutile iridium dioxide (IrO2) with other metal oxides is thermodynamically difficult due to differing crystal structures.
- High solubility of foreign elements in iridium-based solid-solution oxides has been a significant limitation.
Purpose of the Study:
- To demonstrate that hexagonal-perovskite BaIrO3 can act as a flexible matrix for incorporating diverse metal cations.
- To investigate the stability and oxygen evolution reaction (OER) performance of these novel solid-solution oxides under acidic conditions.
Main Methods:
- Synthesis of hexagonal-perovskite BaIrO3 solid solutions with various (post)transition-metal cations.
- Characterization using X-ray absorption spectroscopy and ab initio molecular dynamics simulations.
- Evaluation of OER catalytic activity and stability under acidic conditions (pH = 1).
Main Results:
- BaIrO3 successfully incorporated a wide range of cations (d0 to d10 configurations).
- Ta5+, Nb5+, and Zr4+ cations remained stable during OER in acidic media.
- Trivalent cations (Sc3+, In3+, Fe3+) leached gradually, enhancing OER activity.
- High S-numbers (around 10^6) were achieved at pH = 1, indicating excellent catalytic performance.
Conclusions:
- Hexagonal-perovskite BaIrO3 is a versatile matrix for developing stable OER catalysts.
- Solid-solution methodology offers an effective strategy for reducing iridium usage in acidic water oxidation catalysts.
- The developed catalysts demonstrate potential for stable and long-lasting performance in acidic OER applications.
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