To date, Faradaic efficiencies (FE)

To date, Faradaic efficiencies (FE) greater than 90% for NO3- reduction to NH3 have been achieved on Cu-based catalysts, but typically these require potentials more negative than -0.27 V vs. RHE in NO3--containing 1 M KOH electrolytes, corresponding to an overpotential exceeding 0.96 V.15-19 Previous studies found that alloying Cu with Ni results in a positive shift in the NO3-RR half-wave potential (E1/2), the potential at which the current is equal to one half of the mass transfer limiting current, by ~0.1 V,18, 19 a finding that corresponds to enhanced catalytic activity at a given potential.