Fig. 2: Electrocatalytic NO3RR assessment.

a The LSV curves for Fe2Co1/NC, Fe/NC and Co/NC. b Comparative FEs and NH3 production rate of FeXCoY/NC, Fe/NC and Co/NC at different potentials. c Potential-dependent FEs and NH3 yield for Fe2Co1/NC. d ECSA measurements. (e) Nyquist plots from EIS. f, g Durability testing results. h Comparison of NH3 generation rates under different conditions (inset: 1H NMR spectra). i In situ FTIR spectroscopy of Fe2Co1/NC.