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<p>Developing highly active and durable catalysts to reduce iridium (Ir) usage for the oxygen evolution reaction (OER) is essential for cost-effective hydrogen production via polymer electrolyte membrane water electrolysis (PEMWE). Herein, we report copper–iridium nanotubes (Cu–Ir NTs) with an ultrathin 2&#xa0;nm Ir layer for OER, synthesized through a three-step process: (1) formation of Cu nanowire templates, (2) deposition of an Ir shell layer, and (3) partial removal of the Cu nanowire templates via an acid treatment. X-ray photoelectron spectroscopy analysis reveals strong electronic interactions between Cu and Ir, altering the adsorption energy of oxygen intermediates on Ir surface. Furthermore, the Cu–Ir NTs possess a high electrochemical surface area (ECSA) of 61.9&#xa0;m<sup>2</sup>/g, nearly twice as large as Ir black (30.7&#xa0;m<sup>2</sup>/g), due to an obtained 1-dimensional hollow structure. These synergetic effects result in outstanding OER mass activity (504&#xa0;A/g) and specific activity (8.1&#xa0;A/cm<sup>2</sup>) of the Cu–Ir NTs in acidic media, significantly surpassing Ir black (200&#xa0;A/g, 6.5&#xa0;A/cm<sup>2</sup>). Additionally, the Cu–Ir NTs demonstrate an extended operating time in chronopotentiometry experiment at 10&#xa0;mA/cm<sup>2</sup>. These findings highlight the potential of the Cu–Ir NTs as cost-effective and high-performance OER catalysts for PEMWE.</p>

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One-Dimensional Copper–Iridium Hollow Nanotubes with an Ultra-thin Catalyst Layer for Enhanced Oxygen Evolution Reaction

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月30日

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  • Kihyun Kim,
  • Dongwon Shin,
  • Eom-ji Kim,
  • DongHoon Song,
  • Sang Jae Lee,
  • Junu Bak,
  • Jeonghan Roh,
  • MinJoong Kim,
  • EunAe Cho

摘要

Developing highly active and durable catalysts to reduce iridium (Ir) usage for the oxygen evolution reaction (OER) is essential for cost-effective hydrogen production via polymer electrolyte membrane water electrolysis (PEMWE). Herein, we report copper–iridium nanotubes (Cu–Ir NTs) with an ultrathin 2 nm Ir layer for OER, synthesized through a three-step process: (1) formation of Cu nanowire templates, (2) deposition of an Ir shell layer, and (3) partial removal of the Cu nanowire templates via an acid treatment. X-ray photoelectron spectroscopy analysis reveals strong electronic interactions between Cu and Ir, altering the adsorption energy of oxygen intermediates on Ir surface. Furthermore, the Cu–Ir NTs possess a high electrochemical surface area (ECSA) of 61.9 m2/g, nearly twice as large as Ir black (30.7 m2/g), due to an obtained 1-dimensional hollow structure. These synergetic effects result in outstanding OER mass activity (504 A/g) and specific activity (8.1 A/cm2) of the Cu–Ir NTs in acidic media, significantly surpassing Ir black (200 A/g, 6.5 A/cm2). Additionally, the Cu–Ir NTs demonstrate an extended operating time in chronopotentiometry experiment at 10 mA/cm2. These findings highlight the potential of the Cu–Ir NTs as cost-effective and high-performance OER catalysts for PEMWE.