Operando scanning electrochemical microscopic investigation and visualization of NRR-HER competition in electrochemical NH 3 synthesis

Operando -SECM investigations are utilised for the first time to study the NRR-HER competition during NH 3 synthesis over Cu-Ni 4 B 3 catalyst with high notable NRR activity (F.E.: 43.42%; yield rate: 684 μg NH 3 h −1 mg cat. −1 at −0.3 V in 0.1 M H 2 SO 4 ).