NOVELTY - An electrolytic cell (10) comprises electrolytic cell unit (100) comprising electrode (110), electrode (120), and electrolyte (133), a voltage generator (210), supply (220) of dinitrogen comprising fluid (221), and supply (230) of water comprising fluid (231). The voltage generator is provided to apply negative potential to the electrode (110) and positive potential to electrode (120). The electrolyte is provided to allow transport of protons. The electrode (110) is permeable with respect to protons and non-permeable with respect to oxygen and water.    USE - Electrolytic cell is used for system for producing ammonia (all claimed) for producing agricultural fertilizer.    ADVANTAGE - Ammonia is efficiently produced using electrolytic cell at ambient temperature and pressure, and is thermodynamically stable.    DETAILED DESCRIPTION - An electrolytic cell comprises an electrolytic cell unit comprising an electrode (110), an electrode (120), and an electrolyte, a voltage generator, a supply of dinitrogen comprising fluid, and a supply of water comprising fluid. The voltage generator is provided to apply a negative potential to the electrode (110) and a positive potential to the electrode (120). The electrolyte is provided to allow transport of protons. The electrode (110) is permeable with respect to protons and non-permeable with respect to oxygen and water. The electrode (110) is at side (111) which is in contact with the electrolyte and at side (112) is in fluid contact with the supply of dinitrogen comprising fluid (221). The electrode (120) is permeable with respect to protons, and non-permeable with respect to oxygen or water. The electrode (120) is at side (121) also in contact with the electrolyte, and at side (122) in fluid contact with the supply of water. INDEPENDENT CLAIMS are included for the following:    (1) system, which consists of electrolytic cell and pressure device for providing dinitrogen gas to electrolytic cell at a pressure above ambient pressure, and for retrieving liquid ammonia from the electrolytic cell;    (2) electrolytic cell unit; and    (3) production of ammonia, which involves feeding dinitrogen-containing fluid to the electrode (110), and fluid containing water and potassium hydroxide to electrode (120) while applying a voltage difference of 1.16-3.6 V.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of electrolytic cell for synthesis of ammonia from water and nitrogen.    Electrolytic cell (10)    Electrodes (110,120)    Sides (121,122)    Electrolyte (133)    Voltage generator (210)    Supply (220,230)    Dinitrogen-containing fluid (221)    Fluid containing water (231)