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<p>Compared with conventional oxygen evolution reaction (OER)-paired electrolysis for hydrogen production, ammonia oxidation reaction (AOR)-paired alkaline electrolysis offers enhanced energy efficiency and reduced costs. AOR-paired electrolysis offers a lower theoretical voltage (0.06&#xa0;V) compared to the OER (1.23&#xa0;V), enhancing thermodynamic favorability owing to its lower theoretical voltage requirements but faces stability and performance challenges. However, membrane electrode assembly (MEA) fabrication and operational parameter optimization research related to catalyst material development for AOR-paired systems is lacking. In this study, the cell assembly factors, including gasket thickness, compression forces, thermal conditions, and membrane selection, are analyzed, and the electrolyte concentration and electrochemical operating range are optimized for enhanced AOR-paired alkaline electrolysis performance. The optimal gasket thickness and assembly pressure improve the electrical conductivity and reduce the contact resistance. Higher-temperature operation and appropriate anion-exchange membrane screening enhance the ionic conductivity and reaction kinetics. The optimized KOH/NH<sub>4</sub>OH electrolyte concentration minimizes catalyst poisoning while maintaining high catalytic activity. Strategic potential window optimization mitigates irreversible surface poisoning while enabling catalyst recovery. Pulsed current protocols eliminate the reverse current phenomenon and electrode degradation by using cyclic voltammetry methods. These integrated optimization strategies enhance the current density performance, demonstrating the viability of AOR-paired electrolysis for practical hydrogen production applications.</p>

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Effects of Membrane Electrode Assembly Fabrication and Operation Parameters on the Performance of Anion Exchange Membrane Ammonia Electrolyzers

  • 期刊论文

  • 发表日期：

    2025年12月22日

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  • Seokjin Hong,
  • Minwoo Shin,
  • Gyeong Ho Han,
  • Soo Young Kim,
  • Sang Hyun Ahn

摘要

Compared with conventional oxygen evolution reaction (OER)-paired electrolysis for hydrogen production, ammonia oxidation reaction (AOR)-paired alkaline electrolysis offers enhanced energy efficiency and reduced costs. AOR-paired electrolysis offers a lower theoretical voltage (0.06 V) compared to the OER (1.23 V), enhancing thermodynamic favorability owing to its lower theoretical voltage requirements but faces stability and performance challenges. However, membrane electrode assembly (MEA) fabrication and operational parameter optimization research related to catalyst material development for AOR-paired systems is lacking. In this study, the cell assembly factors, including gasket thickness, compression forces, thermal conditions, and membrane selection, are analyzed, and the electrolyte concentration and electrochemical operating range are optimized for enhanced AOR-paired alkaline electrolysis performance. The optimal gasket thickness and assembly pressure improve the electrical conductivity and reduce the contact resistance. Higher-temperature operation and appropriate anion-exchange membrane screening enhance the ionic conductivity and reaction kinetics. The optimized KOH/NH4OH electrolyte concentration minimizes catalyst poisoning while maintaining high catalytic activity. Strategic potential window optimization mitigates irreversible surface poisoning while enabling catalyst recovery. Pulsed current protocols eliminate the reverse current phenomenon and electrode degradation by using cyclic voltammetry methods. These integrated optimization strategies enhance the current density performance, demonstrating the viability of AOR-paired electrolysis for practical hydrogen production applications.