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<p>Proton exchange membrane water electrolysis (PEMWE) is a promising route for low-carbon hydrogen production, but its practical efficiency is limited by the sluggish oxygen evolution reaction (OER) kinetics under acidic conditions. Although IrO<sub>2</sub> remains the state-of-the-art acidic OER catalyst, its high cost and scarcity motivate strategies that reduce noble-metal loading without compromising performance. Here, we report a simple and scalable hybrid electrocatalyst prepared by physically blending solvothermally synthesized Co-MOF-74 (constructed from cobalt nodes and 2,5-dihydroxyterephthalic linkers) with commercial IrO<sub>2</sub> across a range of controlled mass ratios. Electrochemical testing in 1 M H<sub>2</sub>SO<sub>4</sub> reveals strong composition-dependent OER activity, with an optimized 40 wt% Co-MOF/60 wt% IrO<sub>2</sub> composite achieving an overpotential of 294 mV at 10&#xa0;mA cm<sup>− 2</sup> and maintaining stable operation at this current density for 7&#xa0;h under chronopotentiometric conditions. Structural analysis reveals that IrO<sub>2</sub> nanoparticles are uniformly dispersed across the porous Co-MOF framework, increasing the accessibility of catalytic sites and mitigating IrO<sub>2</sub> agglomeration. Overall, this work demonstrates that a straightforward MOF/oxide physical hybridization approach can effectively lower Ir content while preserving acidic OER activity, offering a practical and cost-effective design pathway for anode catalysts in PEMWE.</p>

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Electrocatalytic performance optimization of Co-MOF-74 and IrO2 hybrid catalysts for acidic oxygen evolution reaction

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月25日

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  • Ma. Ellyza Andrea J. Ona,
  • Muthumeenal Arunachalam,
  • Donghyun Kim,
  • Khaled Youssef,
  • Palani Elumalai,
  • Zhaoyang Liu,
  • Hyunwoong Park,
  • Dong Suk Han

摘要

Proton exchange membrane water electrolysis (PEMWE) is a promising route for low-carbon hydrogen production, but its practical efficiency is limited by the sluggish oxygen evolution reaction (OER) kinetics under acidic conditions. Although IrO2 remains the state-of-the-art acidic OER catalyst, its high cost and scarcity motivate strategies that reduce noble-metal loading without compromising performance. Here, we report a simple and scalable hybrid electrocatalyst prepared by physically blending solvothermally synthesized Co-MOF-74 (constructed from cobalt nodes and 2,5-dihydroxyterephthalic linkers) with commercial IrO2 across a range of controlled mass ratios. Electrochemical testing in 1 M H2SO4 reveals strong composition-dependent OER activity, with an optimized 40 wt% Co-MOF/60 wt% IrO2 composite achieving an overpotential of 294 mV at 10 mA cm− 2 and maintaining stable operation at this current density for 7 h under chronopotentiometric conditions. Structural analysis reveals that IrO2 nanoparticles are uniformly dispersed across the porous Co-MOF framework, increasing the accessibility of catalytic sites and mitigating IrO2 agglomeration. Overall, this work demonstrates that a straightforward MOF/oxide physical hybridization approach can effectively lower Ir content while preserving acidic OER activity, offering a practical and cost-effective design pathway for anode catalysts in PEMWE.