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<p>Reducing overpotential through rational design is the key to building efficient electrocatalysts for water splitting. Traditional alloy catalysts suffer from corrosion susceptibility and limited performance enhancement. In this work, we employ a one-step electrodeposition method to modify NiFe catalysts, the amorphous/crystalline heterostructured CeO<sub>x</sub>/Ni<sub>3</sub>Fe/NiFe-LDH electrocatalyst grown on nickel mesh (NM) surface simultaneously integrates the conductive properties of the alloy catalyst with the electrocatalytic activity and corrosion resistance of oxides/hydroxides. Ce doping enables reversible Ce<sup>4+</sup>/Ce<sup>3+</sup> valence transitions within the NiFe matrix, achieving ultralow overpotentials: The oxygen evolution reaction (OER) exhibits an overpotential of 173&#xa0;mV at 10&#xa0;mA cm<sup>−2</sup> in 1&#xa0;M KOH; the hydrogen evolution overpotential is 71&#xa0;mV, while the overall water splitting requires an overpotential of only 1.56&#xa0;V at 100&#xa0;mA cm<sup>−2</sup> with stable operation for 80&#xa0;h under the same current density. The unique interfacial architecture of the CeO<sub>x</sub>/Ni<sub>3</sub>Fe/NiFe-LDH@NM catalyst enables effective utilization of surface active sites, facilitating efficient electron transport and oxygen reduction charge transfer, thereby achieving superior OER activity. This study provides a novel strategy for designing high-performance electrocatalysts for water splitting applications.</p>

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Ultralow-overpotential bifunctional water splitting using Ce-mediated CeOx/Ni3Fe/NiFe-LDH nanoheterojunction electrocatalysts

  • 期刊论文

  • 发表日期：

    2025年10月10日

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  • Xiaoman Zheng,
  • Zhu Yequan,
  • Ming Shuo,
  • Li Huaizi,
  • Wang Zhenwei

摘要

Reducing overpotential through rational design is the key to building efficient electrocatalysts for water splitting. Traditional alloy catalysts suffer from corrosion susceptibility and limited performance enhancement. In this work, we employ a one-step electrodeposition method to modify NiFe catalysts, the amorphous/crystalline heterostructured CeOx/Ni3Fe/NiFe-LDH electrocatalyst grown on nickel mesh (NM) surface simultaneously integrates the conductive properties of the alloy catalyst with the electrocatalytic activity and corrosion resistance of oxides/hydroxides. Ce doping enables reversible Ce4+/Ce3+ valence transitions within the NiFe matrix, achieving ultralow overpotentials: The oxygen evolution reaction (OER) exhibits an overpotential of 173 mV at 10 mA cm−2 in 1 M KOH; the hydrogen evolution overpotential is 71 mV, while the overall water splitting requires an overpotential of only 1.56 V at 100 mA cm−2 with stable operation for 80 h under the same current density. The unique interfacial architecture of the CeOx/Ni3Fe/NiFe-LDH@NM catalyst enables effective utilization of surface active sites, facilitating efficient electron transport and oxygen reduction charge transfer, thereby achieving superior OER activity. This study provides a novel strategy for designing high-performance electrocatalysts for water splitting applications.