Plasma-driven ammonia synthesis reaction. The experimental setup for ammonia synthesis reaction is shown in Fig. . Different input N2 flowrates were employed i.e., 3.1, 6.2, 12.5, and 25.0 sccm when using water vapor as hydrogen source. Similar input N2 flowrate range was employed in ammonia production from N2/H2 mixtures with the input H2 flowrate fixed at 12.5 sccm. Seawater was contained in a 500 mL DURAN© washing flask container.