Cobalt molybdenum nitride (Co 3 Mo 3 N) catalyst was synthesised through ammonolysis of the corresponding precursors by flowing pure ammonia gas. The catalyst was characterised by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Ammonia was successfully synthesised from wet hydrogen and dry nitrogen at atmospheric pressure using Co 3 Mo 3 N–Ag composite as cathode, Ag–Pd alloy as anode and LiAlO 2 –(Li/Na/K) 2 CO 3 composite as an electrolyte. Ammonia formation was investigated at 400, 425 and 450 °C, and the maximum observed ammonia formation rate was 3.27×10 −10 mol s −1 cm −2 at 450 °C when applied at 0.8 V. The catalytic activity of Co 3 Mo 3 N for electrochemical ammonia synthesis is lower than that of Pd. The successful synthesis of ammonia demonstrates that LiAlO 2 –(Li/Na/K) 2 CO 3 composite exhibits protonic or/and oxygen ion conduction.