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<p>The conventional Haber-Bosch process for ammonia (NH<sub>3</sub>) production is energy-intensive and environmentally unsustainable, driving the search for green alternatives. This study presents a novel plasma-electrocatalytic synthesis ammonia (PESA) strategy that integrates magnetically stabilized glow discharge (MSGD) plasma for NO<sub>x</sub><sup>−</sup> generation from air with electrochemical NO<sub>x</sub><sup>−</sup> reduction reaction (eNO<sub>x</sub>RR) using Co<sub>3</sub>O<sub>4</sub> catalysts to produce NH<sub>3</sub> under ambient conditions. The MSGD system achieves efficient nitrogen fixation with an energy consumption of 2.44&#xa0;MJ/mol NO<sub>x</sub><sup>−</sup> by leveraging vibrational N<sub>2</sub> excitation and ozone-enhanced gas-liquid conversion (96% efficiency). The Co<sub>3</sub>O<sub>4</sub> electrocatalyst exhibits high activity (ECSA: 281.7 cm<sup>2</sup>/mg) and stability, enabling NH<sub>3</sub> production at 11.99&#xa0;mg/h·cm<sup>2</sup> with 78% Faradaic efficiency and 1.76&#xa0;MJ/mol energy cost. The combined PESA system thus demonstrates an overall energy cost of just 4.2&#xa0;MJ/mol for NH<sub>3</sub> synthesis from air and water, outperforming many existing plasma and electrochemical methods. This study offers a scalable and sustainable pathway for green ammonia production under ambient conditions.</p>

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Energy-Efficient Ammonia Synthesis from Air and Water Via Magnetically Stabilized Glow Discharge Coupled with Electrochemical NOx− Reduction

  • 期刊论文

  • 发表日期：

    2025年9月25日

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  • YueXi Liu,
  • ZhiYu Li,
  • LanLan Nie,
  • XueKai Pei,
  • XinPei Lu

摘要

The conventional Haber-Bosch process for ammonia (NH3) production is energy-intensive and environmentally unsustainable, driving the search for green alternatives. This study presents a novel plasma-electrocatalytic synthesis ammonia (PESA) strategy that integrates magnetically stabilized glow discharge (MSGD) plasma for NOx− generation from air with electrochemical NOx− reduction reaction (eNOxRR) using Co3O4 catalysts to produce NH3 under ambient conditions. The MSGD system achieves efficient nitrogen fixation with an energy consumption of 2.44 MJ/mol NOx− by leveraging vibrational N2 excitation and ozone-enhanced gas-liquid conversion (96% efficiency). The Co3O4 electrocatalyst exhibits high activity (ECSA: 281.7 cm2/mg) and stability, enabling NH3 production at 11.99 mg/h·cm2 with 78% Faradaic efficiency and 1.76 MJ/mol energy cost. The combined PESA system thus demonstrates an overall energy cost of just 4.2 MJ/mol for NH3 synthesis from air and water, outperforming many existing plasma and electrochemical methods. This study offers a scalable and sustainable pathway for green ammonia production under ambient conditions.