Facile, cost-effective plasma synthesis of self-supportive FeS x on Fe foam for efficient electrochemical reduction of N 2 under ambient conditions

A non-precious, self-supportive FeS x NRR electrocatalyst was synthesized by a simple H 2 S-plasma treatment on low-cost Fe foam, which shows a remarkable NH 3 production rate of 4.13 × 10 −10 mol s −1 cm −2 and a high faradaic efficiency of 17.6%.