Interfacial Microextraction Boosting Nitrogen Feed for Efficient Ambient Ammonia Synthesis in Aqueous Electrolyte

The extremely low nitrogen (N2) solubility in aqueous solution greatly limits the gas reactant supply to catalysts resulting in a bottleneck in establishing efficient electrocatalytic N2 reduction reaction (NRR). Here, aiming at fairly few N2 dissolving in aqueous electrolyte, an N2‐microextractor (NME) that can extract the N2 from water, then feed it to catalysts on electrodes, is reported. The NME consists of polymer framework and extractant that possess high solubility for N2, which serves as an ultra‐thin interfacial system wrapping around electrodes. As expected, the enhancement of N2 supply in NRR leads to a record‐high Faradaic efficiency (80.1%) with an ammonia yield rate of 58.3 µg h−1 mg−1 under ambient conditions. This is of great significance to a sustainable “Ammonia Economy.” Aiming at fairly few N2 dissolving in aqueous electrolyte, an N2‐microextractor is designed that can extract the N2 from water. The NME consists of a polymer framework and extractant, which serves as an ultra‐thin interfacial system wrapping around electrodes. The enhancement of N2 supply in NRR leads to a record‐high Faradaic efficiency with an ammonia yield rate.