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Commercial nitric acid (HNO 3 ) and ammonia (NH 3 ) are mostly produced through the Ostwald process and the Haber-Bosch process, respectively. However, high energy demand and enormous greenhouse gas accompy these processes. The development of economical and green ways to synthesize HNO 3 and NH 3 is highly desirable for solving the global energy and environmental crisis. Here, we present two energy-efficient and environmentally friendly strategies to synthesize HNO 3 and NH 3 at distributed sources, including the electrocatalytic oxidation of N 2 in air to HNO 3 and the electrocatalytic reduction of residual [Formula: see text] contamination in water to NH 3 . The isotope-labeling studies combined with theoretical calculation reveal the reaction path of the two proposed strategies, confirming the origin of the electrochemical products. Importantly, the electrooxidation-generated [Formula: see text] ions may also serve as reactants for the electroreduction synthesis of NH 3 in the future. Our work may open avenues for energy-efficient and green production of HNO 3 and NH 3 at distributed sources.

Electrochemical synthesis of nitric acid from air and ammonia through waste utilization