Figure 5.

In‐situ Raman spectroscopy analysis of magnesium nitride (Mg₃N₂) formation and consumption during nitrogen reduction. A) Optical image of the cathode surface (Ni foam/electrolyte interface) during in‐situ Raman measurements. B) Time‐dependent Raman spectra (0 min) showing the progressive increase in the Mg₃N₂ peak intensity, indicating nitrogen activation. C) Spectra from 40 min onward reveal a decline in the Mg₃N₂ signal, corresponding to its consumption during ammonia production followed by its stabilization.