▎ 摘　　要

Oxygen-doped graphene (O-G) derived from sodium gluconate is identified as a promising candidate to effectively catalyze ambient electrohydrogenation of N-2 to NH3. Electrochemical tests on O-G in 0.1 M HCl suggest a large NH3 yield of 21.3 mu g h(-1) mg(cat.)(-1) and a high faradaic efficiency of 12.6% at -0.55 and -0.45 V vs. reversible hydrogen electrode, respectively, with strong electrochemical and structural stability in 0.1 M HCl. Density functional theory calculations reveal the NRR catalytic mechanism and suggest that both the C = O and O-C = O groups contribute more greatly to the NRR compared with the C-O group.