Over 56.55% Faradaic efficiency of ambient ammonia synthesis enabled by positively shifting the reaction potential

Abstract Ambient electrochemical N 2 reduction is emerging as a highly promising alternative to the Haber–Bosch process but is typically hampered by a high reaction barrier and competing hydrogen evolution, leading to an extremely low Faradaic efficiency. Here, we demonstrate that under ambient conditions, a single-atom catalyst, iron on nitrogen-doped carbon, could positively shift the ammonia synthesis process to an onset potential of 0.193 V, enabling a dramatically enhanced Faradaic efficiency of 56.55%. The only doublet coupling representing 15 NH 4 + in an isotopic labeling experiment confirms reliable NH 3 production data. Molecular dynamics simulations suggest efficient N 2 access to the single-atom…

• NS
  Natural Science Foundation of Shanghai
• SS
  Salt Science Research Foundation
• NN
  National Natural Science Foundation of China

  Awards: 51872193, 51622208, 21703149