Baik, Chaekyung Choi, Jihyun Kwon, Dayoung Yang, Chaeyeon Lee, Suji Sung, Yung-Eun Kim, Wooyul Park, Hyun S. 2026-05-11T09:30:13Z 2026-05-11T09:30:13Z 2026-05-07 2026-05 1385-8947 https://pubs.kist.re.kr/handle/201004/154737 Low-temperature NH3 electrolysis has emerged as a promising method for carbon-free H2 production, utilizing NH3 as a cost-effective H2 carrier. While most research has focused on NH3 oxidation catalysts, the efficiency, stability, and scalability of NH3 dehydrogenation devices remain underexplored. Here, low-temperature NH3 electrolyzers achieving peak current densities over 1.5 A cm−2 are demonstrated with high efficiency and stability. Electrochemical and chemical regeneration protocols were developed to enhance coulombic efficiency and durability. Using these protocols, ∼90% coulombic efficiency was sustained at 0.67 A cm−2 for 50 min without degradation. Surface poisoning behaviors under different protocols were examined by combining in-situ ATR-SEIRAS (attenuated total reflectance surface-enhanced infrared absorption spectroscopy) with electrochemical analysis. Finally, a 40 W NH3 electrolyzer stack with a 25 cm2, 3-cell configuration showed stable operation at 0.72 A cm−2 for 200 min, with a degradation rate of 75.7 μA cm−2 min−1 under voltage swing operation. This work establishes a systematic approach to low-temperature NH3 electrolysis, enabling stable and efficient intermittent H2 production. English Elsevier BV Efficient and stable 40 W-class low-temperature NH3 electrolyzers for intermittent H2 production Article 10.1016/j.cej.2026.175681 1 Chemical Engineering Journal, v.536 Chemical Engineering Journal 536 N scie scopus 001742366600001 Engineering, Environmental Engineering, Chemical Engineering Article ADSORPTION ELECTRODE SURFACE NO ELECTROCHEMICAL AMMONIA OXIDATION HYDROGEN-PRODUCTION NITRIC-OXIDE THIN-FILMS PT(100) ELECTROCATALYSIS Ammonia electrolysis ammonia oxidation reaction Surface regeneration Voltage swing operation ammonia electrolyzer stack