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<p>Green hydrogen production through seawater electrolysis is a promising strategy, although challenges such as sluggish oxygen evolution reaction (OER) kinetics and chlorine (Cl<sup>−</sup>) corrosion hinder its practical applicability. A novel fluorine (F)-doped cobalt (Co) and iron (Fe) layered metal hydroxide (F-CoFe LMH-8) is developed as a robust bifunctional catalyst achieving 81.23 and 265.5&#xa0;mV at 10&#xa0;mA&#xa0;cm<sup>−2</sup> for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively. Theoretical and experimental studies demonstrate that the F-doping modulates the electronic structure, effectively tuning Fe sites toward a high-spin configuration that optimizes binding energies and induces a chlorophobic effect that repel corrosive (Cl<sup>−</sup>)&#xa0;ions. Notably, the F-CoFe LMH-8( +|| −) bifunctional catalyst integrated anion exchange membrane water electrolyzer (AEMWE) exhibited outstanding performance for continuous H<sub>2</sub> production, achieves a current density of 1.2&#xa0;A&#xa0;cm<sup>−2</sup> in 1&#xa0;M KOH, 1.02&#xa0;A&#xa0;cm<sup>−2</sup> in 1&#xa0;M KOH + 0.5&#xa0;M NaCl, and 1&#xa0;A&#xa0;cm<sup>−2</sup> in 1&#xa0;M KOH in seawater at 2.3&#xa0;V. Furthermore, a long short-term memory-based machine learning model was employed to forecast and predict the stability of F-CoFe LMH-8. This approach provides a comprehensive pathway for heuristic design of durable, chlorophobic, and advanced electrocatalyst for seawater-based AEMWE and large-scale hydrogen production.</p>

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High Polarity Doping of CoFe Layered Hydroxides: Bifunctional and Corrosion-Resistant Anion Exchange Membrane Seawater Electrolyzers

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月1日

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  • Anandhan Ayyappan Saj,
  • Sampath Prabhakaran,
  • Mohsin Rasool,
  • Kousik Bhunia,
  • Dongho Lee,
  • Hyunseok Ko,
  • Tukaram D. Dongale,
  • Muthukumar Perumalsamy,
  • Arul Saravanan Raaju Sundhar,
  • Do Hwan Kim,
  • Sang Jae Kim

摘要

Green hydrogen production through seawater electrolysis is a promising strategy, although challenges such as sluggish oxygen evolution reaction (OER) kinetics and chlorine (Cl−) corrosion hinder its practical applicability. A novel fluorine (F)-doped cobalt (Co) and iron (Fe) layered metal hydroxide (F-CoFe LMH-8) is developed as a robust bifunctional catalyst achieving 81.23 and 265.5 mV at 10 mA cm−2 for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively. Theoretical and experimental studies demonstrate that the F-doping modulates the electronic structure, effectively tuning Fe sites toward a high-spin configuration that optimizes binding energies and induces a chlorophobic effect that repel corrosive (Cl−) ions. Notably, the F-CoFe LMH-8( +|| −) bifunctional catalyst integrated anion exchange membrane water electrolyzer (AEMWE) exhibited outstanding performance for continuous H2 production, achieves a current density of 1.2 A cm−2 in 1 M KOH, 1.02 A cm−2 in 1 M KOH + 0.5 M NaCl, and 1 A cm−2 in 1 M KOH in seawater at 2.3 V. Furthermore, a long short-term memory-based machine learning model was employed to forecast and predict the stability of F-CoFe LMH-8. This approach provides a comprehensive pathway for heuristic design of durable, chlorophobic, and advanced electrocatalyst for seawater-based AEMWE and large-scale hydrogen production.