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<p>Exploring efficient bifunctional electrocatalysts for both hydrogen and oxygen evolution reactions is key to water electrolysis. However, the inherently slow reaction kinetics of electrocatalysis are constrained by the mass transfer limitation and unsuitable adsorption/desorption dynamics. Herein, a Fe-doped-Ni<sub>3</sub>S<sub>2</sub>/NiFeCoCeIn oxide hydroxide (FNS/HEOXY) crystalline–amorphous heterostructure electro-catalyst with a large work function difference (Δ<i>Φ</i>) and strong built-in electric field (BEF) is successfully designed and synthesized. Benefiting from the electron transfer behavior from FNS to HEOXY, the FNS/HEOXY shows outstanding catalytic activity for both hydrogen and oxygen evolution, along with ultra-high stability in an alkaline medium at an industrial-level current density. Moreover, the anion exchange membrane water electrolyzer (AEMWE) assembled by the FNS/HEOXY requires only a minimal cell voltage of 1.83 V to reach 1 A cm<sup>−2</sup> at 80 °C. Both experimental and theoretical results confirm the interfacial charge redistribution induced by the strong BEF, thus finely optimizing the adsorption energy. This work proposes a new design principle toward efficient electrocatalysts for energy conversion.</p>

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Constructing built-in electric field in crystalline-amorphous heterostructure bifunctional electrocatalysts for highly efficient overall water splitting at high current density

  • 期刊论文

  • 发表日期：

    2026年2月14日

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  • Derun Li,
  • Guo Wei,
  • Tao Jiang,
  • Hengyi Wu,
  • Shixin Wu,
  • Zhuo Xing,
  • Liqiu Huang,
  • Shuangshuang Huang,
  • Feng Ren

摘要

Exploring efficient bifunctional electrocatalysts for both hydrogen and oxygen evolution reactions is key to water electrolysis. However, the inherently slow reaction kinetics of electrocatalysis are constrained by the mass transfer limitation and unsuitable adsorption/desorption dynamics. Herein, a Fe-doped-Ni3S2/NiFeCoCeIn oxide hydroxide (FNS/HEOXY) crystalline–amorphous heterostructure electro-catalyst with a large work function difference (ΔΦ) and strong built-in electric field (BEF) is successfully designed and synthesized. Benefiting from the electron transfer behavior from FNS to HEOXY, the FNS/HEOXY shows outstanding catalytic activity for both hydrogen and oxygen evolution, along with ultra-high stability in an alkaline medium at an industrial-level current density. Moreover, the anion exchange membrane water electrolyzer (AEMWE) assembled by the FNS/HEOXY requires only a minimal cell voltage of 1.83 V to reach 1 A cm−2 at 80 °C. Both experimental and theoretical results confirm the interfacial charge redistribution induced by the strong BEF, thus finely optimizing the adsorption energy. This work proposes a new design principle toward efficient electrocatalysts for energy conversion.