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<p>Despite heterogeneous metal atoms doping is a commonly used strategy in the development of oxygen evolution reaction (OER) electrocatalysts, the multifaceted and intricate nature of heteroatom doping effects warrants further investigation. Herein, a Fe-ion doping method is introduced to concurrently regulate surface properties and optimize electronic states, thereby enhancing OER performance. Experimental findings reveal that the incorporation of Fe ions not only induces strong electronic interactions between the metal cations but also transforms the initially hydrophobic Ni<sub>3</sub>Se<sub>2</sub> particles into highly hydrophilic nanosheet arrays with oxyhydroxide-modified surfaces. Thanks to the role of Fe-ion doping in promoting the reaction kinetics and fostering the formation of the genuine NiFeOOH/Fe–Ni<sub>3</sub>Se<sub>2</sub> active phase, the optimized Fe–Ni<sub>3</sub>Se<sub>2</sub>/NF-2 exhibits a low overpotential of 212&#xa0;mV at 10&#xa0;mA&#xa0;cm<sup>−2</sup>, a small Tafel slope of 27.8&#xa0;mV&#xa0;dec<sup>−1</sup>, and long-term stability (&gt; 100&#xa0;h, at 200&#xa0;mA&#xa0;cm<sup>−2</sup>) in 1&#xa0;M KOH for OER. This work provides a deeper understanding on heteroatom doping in OER electrocatalysts.</p>

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Simultaneous surface property and electronic state tuning of Fe-incorporated Ni3Se2 nanosheets for boosted water oxidation

  • 期刊论文

  • 发表日期：

    2025年12月8日

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  • Kai-lu Guo,
  • Wen-jing Zhang,
  • Jin-ge Gao,
  • Jia-wen Wang,
  • Ru-xia Yuan

摘要

Despite heterogeneous metal atoms doping is a commonly used strategy in the development of oxygen evolution reaction (OER) electrocatalysts, the multifaceted and intricate nature of heteroatom doping effects warrants further investigation. Herein, a Fe-ion doping method is introduced to concurrently regulate surface properties and optimize electronic states, thereby enhancing OER performance. Experimental findings reveal that the incorporation of Fe ions not only induces strong electronic interactions between the metal cations but also transforms the initially hydrophobic Ni3Se2 particles into highly hydrophilic nanosheet arrays with oxyhydroxide-modified surfaces. Thanks to the role of Fe-ion doping in promoting the reaction kinetics and fostering the formation of the genuine NiFeOOH/Fe–Ni3Se2 active phase, the optimized Fe–Ni3Se2/NF-2 exhibits a low overpotential of 212 mV at 10 mA cm−2, a small Tafel slope of 27.8 mV dec−1, and long-term stability (> 100 h, at 200 mA cm−2) in 1 M KOH for OER. This work provides a deeper understanding on heteroatom doping in OER electrocatalysts.