Fig. 3

a Linear sweep voltametric curves of Ti₃C₂T_x-low F, Ti₃C₂T_x-medium F and Ti₃C₂T_x-high F in N₂-saturated 0.01 M Na₂SO₄ electrolyte with a scan rate of 5 mV·s⁻¹. b LSV curves of Ti₃C₂T_x-medium F in N₂-saturated (red curve) and Ar-saturated (black curve) 0.01 M Na₂SO₄ electrolyte with a scan rate of 5 mV·s⁻¹. c UV–Vis absorption spectra of N₂RR products of Ti₃C₂T_x-medium F at potentials between ‒0.4 and ‒0.8 V over Ti₃C₂T_x -48% F. d NH₃ yield rate (left y-axis) and Faradaic efficiencies (right y-axis) of Ti₃C₂T_x-medium F MXene at the corresponding potentials