Fig. 1: Electroreductive synthesis of ammonia.

Pathways towards NH₃/NH₄⁺ through the electrochemical reduction of N₂, gaseous NO_x, and ionic NO_x compounds with standard redox potentials (vs. standard hydrogen electrode) and examples^{27,28,29,30,54,55,56,57} of some of the known electrocatalysts for each process.