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<p>The alkaline oxygen evolution reaction is a key step in producing green hydrogen through water electrolysis, but its large-scale industrial application remains limited due to challenges with current electrocatalysts—particularly in terms of scalability, efficiency, and long-term stability. Here we show an industrially scalable synthesis of an active NiFe layered double hydroxide (NiFe-LDH) catalyst using a room-temperature, atmospheric-pressure route. The process involves homogeneous alkalinization, where chloride ions nucleophilically attack an epoxide ring, producing a low-dimensional, defect-rich NiFe-LDH with pronounced iron clustering. In-situ spectroscopy and ab-initio calculations reveal that these structural features maximize the conversion of the NiFe-LDH to the catalytic active phase and minimize the energy barrier, improving catalytic efficiency. When used as the anode in an anion exchange membrane water electrolyzer operating at 70 °C, our material delivers 1 A cm⁻² at 1.69 V in a 5 cm<sup>2</sup> full-cell setup, with notable durability compared to conventional NiFe-LDHs. This scalable approach could considerably lower the cost of green hydrogen production by enabling more efficient alkaline electrolyzers.</p>

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Scalable synthesis of NiFe-layered double hydroxide for efficient anion exchange membrane electrolysis

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月3日

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  • Alvaro Seijas-Da Silva,
  • Adrian Hartert,
  • Víctor Oestreicher,
  • Jorge Romero,
  • Camilo Jaramillo-Hernández,
  • Luuk J. J. Muris,
  • Grégoire Thorez,
  • Bruno J. C. Vieira,
  • Guillaume Ducourthial,
  • Alice Fiocco,
  • Sébastien Legendre,
  • Cristián Huck-Iriart,
  • Martín Mizrahi,
  • Diego López-Alcalá,
  • Anna T. S. Freiberg,
  • Karl J. J. Mayrhofer,
  • João C. Waerenborgh,
  • José J. Baldoví,
  • Serhiy Cherevko,
  • Maria Varela,
  • Simon Thiele,
  • Vicent Lloret,
  • Gonzalo Abellán

摘要

The alkaline oxygen evolution reaction is a key step in producing green hydrogen through water electrolysis, but its large-scale industrial application remains limited due to challenges with current electrocatalysts—particularly in terms of scalability, efficiency, and long-term stability. Here we show an industrially scalable synthesis of an active NiFe layered double hydroxide (NiFe-LDH) catalyst using a room-temperature, atmospheric-pressure route. The process involves homogeneous alkalinization, where chloride ions nucleophilically attack an epoxide ring, producing a low-dimensional, defect-rich NiFe-LDH with pronounced iron clustering. In-situ spectroscopy and ab-initio calculations reveal that these structural features maximize the conversion of the NiFe-LDH to the catalytic active phase and minimize the energy barrier, improving catalytic efficiency. When used as the anode in an anion exchange membrane water electrolyzer operating at 70 °C, our material delivers 1 A cm⁻² at 1.69 V in a 5 cm2 full-cell setup, with notable durability compared to conventional NiFe-LDHs. This scalable approach could considerably lower the cost of green hydrogen production by enabling more efficient alkaline electrolyzers.