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Stabilizing non-iridium active sites by non-stoichiometric oxide for acidic water oxidation at high current density

Author

Listed:
  • Lingxi Zhou

    (Tsinghua University)

  • Yangfan Shao

    (Tsinghua University)

  • Fang Yin

    (Tsinghua University)

  • Jia Li

    (Tsinghua University)

  • Feiyu Kang

    (Tsinghua University
    Tsinghua University)

  • Ruitao Lv

    (Tsinghua University
    Tsinghua University)

Abstract

Stabilizing active sites of non-iridium-based oxygen evolution reaction (OER) electrocatalysts is crucial, but remains a big challenge for hydrogen production by acidic water splitting. Here, we report that non-stoichiometric Ti oxides (TiOx) can safeguard the Ru sites through structural-confinement and charge-redistribution, thereby extending the catalyst lifetime in acid by 10 orders of magnitude longer compared to that of the stoichiometric one (Ru/TiO2). By exploiting the redox interaction-engaged strategy, the in situ growth of TiOx on Ti foam and the loading of Ru nanoparticles are realized in one step. The as-synthesized binder-free Ru/TiOx catalyst exhibits low OER overpotentials of 174 and 265 mV at 10 and 500 mA cm−2, respectively. Experimental characterizations and theoretical calculations confirm that TiOx stabilizes the Ru active center, enabling operation at 10 mA cm−2 for over 37 days. This work opens an avenue of using non-stoichiometric compounds as stable and active materials for energy technologies.

Suggested Citation

  • Lingxi Zhou & Yangfan Shao & Fang Yin & Jia Li & Feiyu Kang & Ruitao Lv, 2023. "Stabilizing non-iridium active sites by non-stoichiometric oxide for acidic water oxidation at high current density," Nature Communications, Nature, vol. 14(1), pages 1-12, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-43466-x
    DOI: 10.1038/s41467-023-43466-x
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    1. Zhan Zhao & Jianpeng Sun & Xiang Li & Shiyu Qin & Chunhu Li & Zisheng Zhang & Zizhen Li & Xiangchao Meng, 2024. "Engineering active and robust alloy-based electrocatalyst by rapid Joule-heating toward ampere-level hydrogen evolution," Nature Communications, Nature, vol. 15(1), pages 1-15, December.

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