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<p>The development of efficient and stable transition metal-based electrocatalysts has always been an important step in the development of low-cost electrocatalysts for water splitting. High-entropy alloys (HEAs) comprising five or more elements in near-equiatomic proportions have attracted ever-increasing attention for their distinctive properties, such as exceptional strength, corrosion resistance, high hardness, and excellent ductility. Herein, FeCoCrNiAl, FeCoCrNiCu, and FeCoCrNiAlCu high-entropy alloys were prepared by vacuum arc furnace melting, and the effects of different element compositions on electrocatalytic reactions were explored. The results show that the FeCoCrNiAlCu high-entropy alloy (HEA) exhibits an excellent catalytic activity in a 0.5&#xa0;M H<sub>2</sub>SO<sub>4</sub> solution. Hence, the FeCoCrNiAlCu HEA exhibits an overpotential of 134&#xa0;mV at 10&#xa0;mA&#xa0;cm<sup>-2</sup> for the hydrogen evolution reaction (HER), which is lower than FeCoCrNiAl (189.3&#xa0;mV), FeCoCrNiCu (191.3&#xa0;mV) and the FeCoCrNiAlCu HEA possesses a relatively low Tafel slope (99.8&#xa0;mV dec-1). Furthermore, it exhibits superior stability for i-t cycle. This work provides a useful method to design high-efficiency and low-cost high-entropy alloy catalysts for various necessary reactions.</p>

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High-Entropy Alloy FeCoCrNiAlCu Reinforced Electrocatalytic Performance for High-Efficiency Electrocatalytic Water Splitting in Acidic Environment

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Yuanwu Zhang,
  • Jinyuan Zhong,
  • Xiaoran Huo,
  • Chunye Wang,
  • Xiaojiao Zuo,
  • Nannan Zhang,
  • Taikai Liu

摘要

The development of efficient and stable transition metal-based electrocatalysts has always been an important step in the development of low-cost electrocatalysts for water splitting. High-entropy alloys (HEAs) comprising five or more elements in near-equiatomic proportions have attracted ever-increasing attention for their distinctive properties, such as exceptional strength, corrosion resistance, high hardness, and excellent ductility. Herein, FeCoCrNiAl, FeCoCrNiCu, and FeCoCrNiAlCu high-entropy alloys were prepared by vacuum arc furnace melting, and the effects of different element compositions on electrocatalytic reactions were explored. The results show that the FeCoCrNiAlCu high-entropy alloy (HEA) exhibits an excellent catalytic activity in a 0.5 M H2SO4 solution. Hence, the FeCoCrNiAlCu HEA exhibits an overpotential of 134 mV at 10 mA cm-2 for the hydrogen evolution reaction (HER), which is lower than FeCoCrNiAl (189.3 mV), FeCoCrNiCu (191.3 mV) and the FeCoCrNiAlCu HEA possesses a relatively low Tafel slope (99.8 mV dec-1). Furthermore, it exhibits superior stability for i-t cycle. This work provides a useful method to design high-efficiency and low-cost high-entropy alloy catalysts for various necessary reactions.