Sustainable routes for the production of renewable energy and fuels, electrification of the chemical industry and pollution management are becoming increasingly attractive from both environmental and economical perspectives as renewable electricity prices continue to drop. Within this context, electrosynthesis, powered by renewable electricity, is an emerging green alternative to conventional thermochemical routes. Green NH3 production based upon this technology is a promising strategy to replace the energy-intensive and CO2 emitting Haber-Bosch process, mainly used for the preparation of ammonia fertilizer. While N2 is obviously the most abundant building block for this reaction, the intrinsic inertness of this molecule due to the high N≡N dissociation energy (941 kJ.mol -1 ) as well as its low solubility in water, render its conversion to NH3 within an electrolyzer exceptionally difficult. As an alternative, NO3 -, widely known as a common pollutant found in agricultural runoff as in industrial wastewater, can also be converted to NH3.