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<p>The development of electrocatalysts with high catalytic activity while minimizing the use of precious metals such as iridium (Ir) is essential for advancing hydrogen and oxygen evolution reactions (HER and OER) in anion-exchange membrane water electrolysis (AEMWE) systems. In this study, an Ir-based ternary alloy (Ir–Ni–Co) was synthesized via a simple wet-chemical reduction method using NaBH<sub>4</sub> as the reducing agent. The resulting IrNiCo alloy electrocatalyst (270&#xa0;mV and 160&#xa0;mA/cm<sup>2</sup> @1.8V<sub>RHE</sub>) exhibited excellent OER performance, achieving an overpotential more than 70&#xa0;mV lower than that of commercial IrO<sub>2</sub> (340&#xa0;mV and 51&#xa0;mA/cm<sup>2</sup> @1.8V<sub>RHE</sub>) at 10&#xa0;mA/cm<sup>2</sup>, along with remarkable durability, showing only a 22.8&#xa0;mV increase versus the reversible hydrogen electrode (RHE) after 24&#xa0;h of continuous operation in 1&#xa0;M KOH. This outstanding activity and stability are attributed to the synergistic alloying of Ir with 3d transition metals (Ni and Co), which modulates the adsorption energy of oxygen intermediates, a key factor in enhancing OER kinetics. Notably, the IrNiCo electrocatalyst also demonstrated stable overall water-splitting performance in a two-electrode full-cell configuration. These findings highlight that ternary Ir-based alloys synthesized through this facile wet-chemical approach hold strong promise as next-generation commercial electrocatalysts for alkaline water electrolysis.</p> Graphical Abstract <p></p>

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Design and Facile Wet-Chemical Synthesis of Ternary Ir-Based Alloy Electrocatalysts for OER Applications

  • 期刊论文

  • 发表日期：

    2026年4月9日

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  • Seong Ji Kim,
  • Jin Ho Lee,
  • Oi Lun Li,
  • Dong-Ha Lim,
  • Hee Soo Kim

摘要

The development of electrocatalysts with high catalytic activity while minimizing the use of precious metals such as iridium (Ir) is essential for advancing hydrogen and oxygen evolution reactions (HER and OER) in anion-exchange membrane water electrolysis (AEMWE) systems. In this study, an Ir-based ternary alloy (Ir–Ni–Co) was synthesized via a simple wet-chemical reduction method using NaBH4 as the reducing agent. The resulting IrNiCo alloy electrocatalyst (270 mV and 160 mA/cm2 @1.8VRHE) exhibited excellent OER performance, achieving an overpotential more than 70 mV lower than that of commercial IrO2 (340 mV and 51 mA/cm2 @1.8VRHE) at 10 mA/cm2, along with remarkable durability, showing only a 22.8 mV increase versus the reversible hydrogen electrode (RHE) after 24 h of continuous operation in 1 M KOH. This outstanding activity and stability are attributed to the synergistic alloying of Ir with 3d transition metals (Ni and Co), which modulates the adsorption energy of oxygen intermediates, a key factor in enhancing OER kinetics. Notably, the IrNiCo electrocatalyst also demonstrated stable overall water-splitting performance in a two-electrode full-cell configuration. These findings highlight that ternary Ir-based alloys synthesized through this facile wet-chemical approach hold strong promise as next-generation commercial electrocatalysts for alkaline water electrolysis.

Graphical Abstract