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<p>The use of single-atom catalysts is an effective way to reduce the amount of iridium in proton exchange membrane water electrolysis (PEM-WE). However, conventional methods can only obtain surface-loaded single atoms or clusters which cannot meet the needs of high current density and stability. In this study, assisted by lanthanum-doping-induced ion exchange, we realize atomically anchoring iridium within the Co<sub>3</sub>O<sub>4</sub> lattice. The lattice anchored iridium in lanthanum-doped Co<sub>3</sub>O<sub>4</sub> exhibits higher atomic dispersion, a larger average coordination number, and an elevated oxidation state. This improvement stimulates the oxide path mechanism (OPM), resulting in enhanced activity (236 mV at 10 mA cm<sup>−2</sup>) and stability (1000 h at 10 mA cm<sup>−2</sup>). Impressively, our catalyst demonstrates notable performance in a PEM electrolyzer with an iridium mass loading of just 0.2 mg<sub>Ir</sub> cm<sup>−2</sup>, achieving a low cell voltage of 1.61 V at 1.0 A cm<sup>−2</sup> and maintaining stable operation for over 1000 h. This work presents an effective strategy for fabricating low-noble-metal-loading catalysts with enhanced efficiency for PEM-WE.</p>

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Lanthanum-assisted lattice anchoring of iridium in Co3O4 for efficient oxygen evolution reaction in low-iridium water electrolysis

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月31日

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  • Zhuoming Wei,
  • Yunxuan Ding,
  • Weili Shi,
  • Feiyang Zhang,
  • Yuxiang Song,
  • Xin Cui,
  • Yu Guo,
  • Licheng Sun,
  • Qike Jiang,
  • Biaobiao Zhang

摘要

The use of single-atom catalysts is an effective way to reduce the amount of iridium in proton exchange membrane water electrolysis (PEM-WE). However, conventional methods can only obtain surface-loaded single atoms or clusters which cannot meet the needs of high current density and stability. In this study, assisted by lanthanum-doping-induced ion exchange, we realize atomically anchoring iridium within the Co3O4 lattice. The lattice anchored iridium in lanthanum-doped Co3O4 exhibits higher atomic dispersion, a larger average coordination number, and an elevated oxidation state. This improvement stimulates the oxide path mechanism (OPM), resulting in enhanced activity (236 mV at 10 mA cm−2) and stability (1000 h at 10 mA cm−2). Impressively, our catalyst demonstrates notable performance in a PEM electrolyzer with an iridium mass loading of just 0.2 mgIr cm−2, achieving a low cell voltage of 1.61 V at 1.0 A cm−2 and maintaining stable operation for over 1000 h. This work presents an effective strategy for fabricating low-noble-metal-loading catalysts with enhanced efficiency for PEM-WE.