Eum, Heesung Cheong, Seok-Hyeon Kim, Jiyun Han, Seo-Jung Kang, Minji Yoon, Sungho Lee, Hae-Seok Cheong, Minserk Lee, Hyunjoo Lee, Dong Ki 2025-05-30T01:30:09Z 2025-05-30T01:30:09Z 2025-05-29 2025-06 2380-8195 https://pubs.kist.re.kr/handle/201004/152524 Efficient removal of nitric oxide (NO) from flue gases remains a significant environmental challenge due to its low concentration, poor water solubility, and the presence of oxygen, which deactivates traditional NO absorbents such as Fe2+-EDTA. Herein, we present an electrochemistry-based reactive NO capture system using SO3-functionalized Fe2+-salen as an NO absorbent with outstanding oxygen resistance. The unique tetracoordinate structure of the salen-SO3 ligand reduces the electron density at the Fe2+ center, preventing its oxidation to Fe3+ under air exposure. Coupled with highly porous NiMo electrocatalysts, the system achieves an NH3 production rate of 2.0 mmol h-1 cm-2 geo with 97% Faraday efficiency under 100% NO. This continuous NO capture and conversion into NH3 was maintained under air-exposed conditions at 60% of the performance level under 100% NO, with stability over 160 h. Mechanistic studies reveal that Fe2+ is the critical active site for NO reduction and elucidate complete reaction pathways for NH3 synthesis. English American Chemical Society Electrocatalytic Reactive Capture of NO from O2-Containing Simulated Flue Gas Using Highly O2-Resistant Fe2+-(salen-SO3) for NH3 Synthesis Article 10.1021/acsenergylett.5c01278 1 ACS Energy Letters, v.10, no.6, pp.2880 - 2888 ACS Energy Letters 10 6 2880 2888 Y scie scopus 001491826700001 2-s2.0-105005512045 Chemistry, Physical Electrochemistry Energy & Fuels Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Science & Technology - Other Topics Materials Science Article ABSORPTION WATER NITRIC-OXIDE REDUCTION