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<p>Electrocatalytic oxygen evolution reaction (OER) is key to several energy technologies but suffers from low activity. Leveraging the lattice oxygen activation mechanism (LOM) is a strategy for boosting its activity. However, this approach faces significant thermodynamic challenges, requiring high-valent oxidation of metal ions without compromising their stability. We reveal that high-entropy alloys (HEAs) can efficiently activate the LOM through synergistic multi-path electron transfer. Specifically, the oxidation of nickel is enhanced by this electron transfer, aided by the integration of weaker Co-O bonds, enabling effective LOM at the Ni-Co dual-site. These insights allow the design of a NiFeCoCrW<sub>0.2</sub> HEA that exhibits improved activity, achieving an overpotential of 220 mV at a current density of 10 mA cm<sup>−2</sup>. It also demonstrates good stability, maintaining the potential with less than 5% variation over 90 days at 100 mA cm<sup>−2</sup> current density. This study sheds light on the synergistic effects that confer high activity in HEAs and contribute to the advancement of high-performance OER electrocatalysts.</p>

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High-entropy alloy enables multi-path electron synergism and lattice oxygen activation for enhanced oxygen evolution activity

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年4月8日

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  • Tao Zhang,
  • Hui-Feng Zhao,
  • Zheng-Jie Chen,
  • Qun Yang,
  • Niu Gao,
  • Li Li,
  • Na Luo,
  • Jian Zheng,
  • Shi-Da Bao,
  • Jing Peng,
  • Xu Peng,
  • Xin-Wang Liu,
  • Hai-Bin Yu

摘要

Electrocatalytic oxygen evolution reaction (OER) is key to several energy technologies but suffers from low activity. Leveraging the lattice oxygen activation mechanism (LOM) is a strategy for boosting its activity. However, this approach faces significant thermodynamic challenges, requiring high-valent oxidation of metal ions without compromising their stability. We reveal that high-entropy alloys (HEAs) can efficiently activate the LOM through synergistic multi-path electron transfer. Specifically, the oxidation of nickel is enhanced by this electron transfer, aided by the integration of weaker Co-O bonds, enabling effective LOM at the Ni-Co dual-site. These insights allow the design of a NiFeCoCrW0.2 HEA that exhibits improved activity, achieving an overpotential of 220 mV at a current density of 10 mA cm−2. It also demonstrates good stability, maintaining the potential with less than 5% variation over 90 days at 100 mA cm−2 current density. This study sheds light on the synergistic effects that confer high activity in HEAs and contribute to the advancement of high-performance OER electrocatalysts.