Effect of Electrolyte and Electrode Configuration on Cu-Catalyzed Nitric Oxide Reduction to Ammonia
Cu electrodes favour ammonia formation from NO reduction in acid, while neutral conditions shift selectivity toward N₂O and N₂ — confirmed by EC-MS. However, using a hollow fiber electrode geometry with high NO gas flow rates, ~90% faradaic efficiency and 400 μmol h⁻² cm⁻² NH₃ production are achieved even at neutral pH, pointing toward viable waste-NO-to-fertilizer conversion.