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<p>Herein, one series of high-entropy alloys (HEAs) are synthesized via pulse liquid-phase microwave method and employed as efficient electrocatalysts towards the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in both acid and alkali electrolytes. The as-synthesized Pt-based HEA catalysts comprise Pt, Ni, Cu, Al, and Sn elements, where Pt content varies, with almost equal contents of other elements. The Pt content in HEA catalysts is as a crucial factor for the ORR and OER catalytic activity and long-term durability. The possible ORR and OER mechanisms on the HEA catalysts in acid and alkali electrolytes is proposed. The synergistic effect of multiple-doped HEA catalysts imparts the improved ORR/OER activity. Multielement in HEAs lower the ORR/OER energy barrier and this is speculated to be the rate-determining stage in the entire catalytic process. Thus, the robust design of low-Pt-content HEA catalysts (i.e., 5–10 at%) offers a more significant ORR/OER current density, imparting a larger number of active sites, and lowering the reaction resistance as compared to high-Pt-content ones. Electrochemical impedance spectroscopy also confirms that low Pt content-based HEA catalysts enable enhanced catalytic activity with long-term durability, based on the analysis of the equivalent circuits.</p>

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High-entropy alloys with low platinum content: novel catalysts for oxygen reduction and evolution reactions

  • 期刊论文

  • 发表日期：

    2025年2月3日

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  • Siyong Gu,
  • Heng-Yu Huang,
  • You-Cheng Lin,
  • Chiao-An Hsieh,
  • Pradeep Kumar Panda,
  • Jeng-Kuei Chang,
  • Chien-Te Hsieh

摘要

Herein, one series of high-entropy alloys (HEAs) are synthesized via pulse liquid-phase microwave method and employed as efficient electrocatalysts towards the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in both acid and alkali electrolytes. The as-synthesized Pt-based HEA catalysts comprise Pt, Ni, Cu, Al, and Sn elements, where Pt content varies, with almost equal contents of other elements. The Pt content in HEA catalysts is as a crucial factor for the ORR and OER catalytic activity and long-term durability. The possible ORR and OER mechanisms on the HEA catalysts in acid and alkali electrolytes is proposed. The synergistic effect of multiple-doped HEA catalysts imparts the improved ORR/OER activity. Multielement in HEAs lower the ORR/OER energy barrier and this is speculated to be the rate-determining stage in the entire catalytic process. Thus, the robust design of low-Pt-content HEA catalysts (i.e., 5–10 at%) offers a more significant ORR/OER current density, imparting a larger number of active sites, and lowering the reaction resistance as compared to high-Pt-content ones. Electrochemical impedance spectroscopy also confirms that low Pt content-based HEA catalysts enable enhanced catalytic activity with long-term durability, based on the analysis of the equivalent circuits.