Fig. 1: Schematic of the Li-mediated nitrogen reduction reaction in a batch-type cell.
From: The Effect of Applied Potential on the Li-mediated Nitrogen Reduction Reaction Performance

Although most of the reaction steps have been identified, the protonation mechanism of Li3N remains disputed, but ammonia formation seems to occur via a LixNyHz complex within the SEI12,56. The protons for the reaction are directly supplied by EtOH and indirectly by THF oxidation at the anode via the proton shuttle29,44.