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<p>Nitric oxide (NO) emissions pose significant environmental challenges that demand sustainable remediation strategies. Here we report an electrochemical approach to convert NO into salt-free, concentrated nitric acid (HNO<sub>3</sub>) using a carbon-based catalyst at near-ambient conditions. The system achieves &gt;90% HNO<sub>3</sub> Faradaic efficiency (FE) at 100 mA cm<sup>−</sup><sup>2</sup> with pure NO and retains &gt;70% FE with dilute NO (0.5 vol%). Mechanistic studies identified nitrous acid as a critical intermediate, diverging from conventional thermocatalytic nitrogen dioxide pathways. By implementing a vapour-fed strategy in a membrane electrode assembly electrolyser, we directly synthesized 32 wt% HNO<sub>3</sub> from NO and deionized water, achieving 86% FE at 800 mA cm<sup>−</sup><sup>2</sup> without electrolyte additives or downstream purification. This work establishes an electrochemical route to valorize NO emissions to high-purity HNO<sub>3</sub>, advancing sustainable pollution mitigation and chemical manufacturing.</p><p></p>

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Electrochemical oxidation of nitric oxide to concentrated nitric acid with carbon-based catalysts at near-ambient conditions

  • 期刊论文

  • 发表日期：

    2025年4月3日

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  • Rong Xia,
  • Sydnee Dronsfield,
  • Ahryeon Lee,
  • Bradie S. Crandall,
  • Jiashun Liang,
  • Bjorn Hasa,
  • Andy Redder,
  • Gang Wu,
  • Tiago J. Goncalves,
  • Samira Siahrostami,
  • Feng Jiao

摘要

Nitric oxide (NO) emissions pose significant environmental challenges that demand sustainable remediation strategies. Here we report an electrochemical approach to convert NO into salt-free, concentrated nitric acid (HNO3) using a carbon-based catalyst at near-ambient conditions. The system achieves >90% HNO3 Faradaic efficiency (FE) at 100 mA cm−2 with pure NO and retains >70% FE with dilute NO (0.5 vol%). Mechanistic studies identified nitrous acid as a critical intermediate, diverging from conventional thermocatalytic nitrogen dioxide pathways. By implementing a vapour-fed strategy in a membrane electrode assembly electrolyser, we directly synthesized 32 wt% HNO3 from NO and deionized water, achieving 86% FE at 800 mA cm−2 without electrolyte additives or downstream purification. This work establishes an electrochemical route to valorize NO emissions to high-purity HNO3, advancing sustainable pollution mitigation and chemical manufacturing.