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Reconstructed Ir‒O‒Mo species with strong Brønsted acidity for acidic water oxidation

Author

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  • Shiyi Chen

    (Tianjin University
    Collaborative Innovative Centre of Chemical Science and Engineering (Tianjin))

  • Shishi Zhang

    (Tianjin University
    Collaborative Innovative Centre of Chemical Science and Engineering (Tianjin))

  • Lei Guo

    (Tianjin University
    Collaborative Innovative Centre of Chemical Science and Engineering (Tianjin))

  • Lun Pan

    (Tianjin University
    Collaborative Innovative Centre of Chemical Science and Engineering (Tianjin)
    Haihe Laboratory of Sustainable Chemical Transformations)

  • Chengxiang Shi

    (Tianjin University
    Collaborative Innovative Centre of Chemical Science and Engineering (Tianjin)
    Haihe Laboratory of Sustainable Chemical Transformations)

  • Xiangwen Zhang

    (Tianjin University
    Collaborative Innovative Centre of Chemical Science and Engineering (Tianjin)
    Haihe Laboratory of Sustainable Chemical Transformations)

  • Zhen-Feng Huang

    (Tianjin University
    Collaborative Innovative Centre of Chemical Science and Engineering (Tianjin)
    Haihe Laboratory of Sustainable Chemical Transformations)

  • Guidong Yang

    (Xi’an Jiaotong University)

  • Ji-Jun Zou

    (Tianjin University
    Collaborative Innovative Centre of Chemical Science and Engineering (Tianjin)
    Haihe Laboratory of Sustainable Chemical Transformations)

Abstract

Surface reconstruction generates real active species in electrochemical conditions; rational regulating reconstruction in a targeted manner is the key for constructing highly active catalyst. Herein, we use the high-valence Mo modulated orthorhombic Pr3Ir1−xMoxO7 as model to activate lattice oxygen and cations, achieving directional and accelerated surface reconstruction to produce self-terminated Ir‒Obri‒Mo (Obri represents the bridge oxygen) active species that is highly active for acidic water oxidation. The doped Mo not only contributes to accelerated surface reconstruction due to optimized Ir‒O covalency and more prone dissolution of Pr, but also affords the improved durability resulted from Mo-buffered charge compensation, thereby preventing fierce Ir dissolution and excessive lattice oxygen loss. As such, Ir‒Obri‒Mo species could be directionally generated, in which the strong Brønsted acidity of Obri induced by remaining Mo assists with the facilitated deprotonation of oxo intermediates, following bridging-oxygen-assisted deprotonation pathway. Consequently, the optimal catalyst exhibits the best activity with an overpotential of 259 mV to reach 10 mA cmgeo−2, 50 mV lower than undoped counterpart, and shows improved stability for over 200 h. This work provides a strategy of directional surface reconstruction to constructing strong Brønsted acid sites in IrOx species, demonstrating the perspective of targeted electrocatalyst fabrication under in situ realistic reaction conditions.

Suggested Citation

  • Shiyi Chen & Shishi Zhang & Lei Guo & Lun Pan & Chengxiang Shi & Xiangwen Zhang & Zhen-Feng Huang & Guidong Yang & Ji-Jun Zou, 2023. "Reconstructed Ir‒O‒Mo species with strong Brønsted acidity for acidic water oxidation," Nature Communications, Nature, vol. 14(1), pages 1-13, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-39822-6
    DOI: 10.1038/s41467-023-39822-6
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