Li-m E-NRR possible different mechanisms. The elliptical circles highlight the electrochemically driven steps. From the left: M1) with both chemical N2splitting and protonation; M2) with both electrochemical N2splitting and protonation; M3) the mix of the previous two models, with chemical N2splitting and electrochemical protonation; M4) vice versa, i.e), combination of electrochemical N2splitting and subsequent chemical protonation. Adapted and reprinted with permission from.[91]
