Fig. 4. Electrochemical in situ FTIR spectra.

Electrochemical thin-layer in situ FTIR spectra of NO₃⁻RR on Cu₅₀Co₅₀ (a), Cu (b), and Co (c) in 100 mM KNO₃ + 1 M KOH. d $\frac{{\mathrm{I}}_{{\mathrm{NO}}_2^{-}}}{{\mathrm{I}}_{{\mathrm{NH}}_2\mathrm{OH}}+{\mathrm{I}}_{{\mathrm{NO}}_2^{-}}}$ ratio at different electrode potentials. ATR-FTIR spectra on Cu₅₀Co₅₀ (e), Cu (f), and Co (g) in 1 M KOH.