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<p>Developing a high-efficiency and stable bifunctional electrocatalyst for water splitting is vitally essential. Herein, we developed the Pt-decorated FeCoNiMnCr high-entropy (Oxy) hydroxides (HEH) on the surface of Ni foam (NF) as a bifunctional catalyst through a facile two-step electrodeposition strategy at ambient temperature. The obtained Pt/FeCoNiMnCr HEH/NF exhibited three-dimensional porous structures composed of interconnected ultrathin nanosheets, favoring the large active surface area and ions/mass transport during the reaction. The Pt/FeCoNiMnCr HEH electrocatalyst displayed exceptional electrocatalytic performance, achieving a low overpotential of 306 mV at 100 mA cm<sup>−2</sup> for oxygen evolution reaction (OER) and only 116 mV at 50 mA cm<sup>−2</sup> for hydrogen evolution reaction (HER), respectively. The enhanced catalytic performance could be attributed to the synergistic effect of the unique ultrathin nanosheet structure of Pt/FeCoNiMnCr HEH and the electronic coupling effect between Pt nanoparticles (NPs) and FeCoNiMnCr HEH. Furthermore, the Pt-decorated FeCoNiMnCr HEH catalyst employed as both the cathode and anode toward water splitting required only 1.56 V to achieve a current density of 20 mA cm<sup>−2</sup> and stably operated for over 50 h. This strategy provides a novel idea for the construction of efficient bifunctional electrocatalysts for water splitting.</p>

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Pt-decorated high entropy FeCoNiMnCr (Oxy) hydroxides as a bifunctional electrocatalyst towards electrochemical water splitting

  • 期刊论文

  • 发表日期：

    2025年6月25日

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  • Liying Han,
  • Yongkang Dong,
  • Haotian Zhao,
  • Jinfeng Zhang,
  • Jie Liu,
  • Cheng Zhong,
  • Wenbin Hu

摘要

Developing a high-efficiency and stable bifunctional electrocatalyst for water splitting is vitally essential. Herein, we developed the Pt-decorated FeCoNiMnCr high-entropy (Oxy) hydroxides (HEH) on the surface of Ni foam (NF) as a bifunctional catalyst through a facile two-step electrodeposition strategy at ambient temperature. The obtained Pt/FeCoNiMnCr HEH/NF exhibited three-dimensional porous structures composed of interconnected ultrathin nanosheets, favoring the large active surface area and ions/mass transport during the reaction. The Pt/FeCoNiMnCr HEH electrocatalyst displayed exceptional electrocatalytic performance, achieving a low overpotential of 306 mV at 100 mA cm−2 for oxygen evolution reaction (OER) and only 116 mV at 50 mA cm−2 for hydrogen evolution reaction (HER), respectively. The enhanced catalytic performance could be attributed to the synergistic effect of the unique ultrathin nanosheet structure of Pt/FeCoNiMnCr HEH and the electronic coupling effect between Pt nanoparticles (NPs) and FeCoNiMnCr HEH. Furthermore, the Pt-decorated FeCoNiMnCr HEH catalyst employed as both the cathode and anode toward water splitting required only 1.56 V to achieve a current density of 20 mA cm−2 and stably operated for over 50 h. This strategy provides a novel idea for the construction of efficient bifunctional electrocatalysts for water splitting.