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Effect of ionic-bonding d0 cations on structural durability in barium iridates for oxygen evolution electrocatalysis

Author

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  • Yelyn Sim

    (Korea Advanced Institute of Science and Technology)

  • Tae Gyu Yun

    (Korea Advanced Institute of Science and Technology)

  • Ki Hyun Park

    (Korea Advanced Institute of Science and Technology)

  • Dongho Kim

    (Korea Advanced Institute of Science and Technology)

  • Hyung Bin Bae

    (Korea Advanced Institute of Science and Technology)

  • Sung-Yoon Chung

    (Korea Advanced Institute of Science and Technology)

Abstract

Iridium has the exclusive chemistry guaranteeing both high catalytic activity and sufficient corrosion resistance in a strong acidic environment under anodic potential. Complex iridates thus attract considerable attention as high-activity electrocatalysts with less iridium utilization for the oxygen evolution reaction (OER) in water electrolyzers using a proton-exchange membrane. Here we demonstrate the effect of chemical doping on the durability of hexagonal-perovskite Bax(M,Ir)yOz-type iridates in strong acid (pH ~ 0). Some aliovalent cations are directly visualized to periodically locate at the octahedral sites bridging the two face-sharing [Ir2O9] dimer or [Ir3O12] trimers in hexagonal-perovskite polytypes. In particular, highly ionic bonding of the d0 Nb5+ and Ta5+ cations with oxygen anions results in notable suppression of lattice oxygen participation during the OER and thus effectively preserves the connectivity between the [Ir3O12] trimers without lattice collapse. Providing an in-depth understanding of the correlation between the electronic structure and bonding nature in crystals, our work suggests that proper control of chemical doping in complex oxides promises a simple but efficient tool to realize OER electrocatalysts with markedly improved durability.

Suggested Citation

  • Yelyn Sim & Tae Gyu Yun & Ki Hyun Park & Dongho Kim & Hyung Bin Bae & Sung-Yoon Chung, 2025. "Effect of ionic-bonding d0 cations on structural durability in barium iridates for oxygen evolution electrocatalysis," Nature Communications, Nature, vol. 16(1), pages 1-14, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-024-55290-y
    DOI: 10.1038/s41467-024-55290-y
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