fig1

Figure 1. (A) Schematic proton-shuttling process for lithium-mediated ammonia synthesis in a continuous flow reactor; (B) Ammonia faradaic efficiencies for a variety of proton shuttles by passing a total charge of 700 C (over 2.5 h) with the constant potential cycling (-6 mA·cm^-2 for 1 min and then 0 mA·cm^-2 for 1 min); (C) Demonstration of the ability of phenol for proton shuttling; (D) A 1D plot of ammonia FE vs. concentrations of proton shuttle with different pK_a in THF; (E) Heatmap of the predicted ammonia FE as a function of the pK_a of proton shuttle (x-axis) and diffusion coefficient (y-axis). (This figure is reproduced with permission from Fu et al.^[8].) FE: Faradaic efficiency; THF: tetrahydrofuran.