NOVELTY - Electrochemical production of urea comprises: (A) introducing carbon dioxide and nitrogen oxides to a solution of an electrolyte and a heterocyclic catalyst in an electrochemical cell, where (i) the electrochemical cell includes an anode in a first cell compartment and a cathode in a second cell compartment and (ii) the cathode reduces the carbon dioxide into a first sub-product and the nitrogen oxides into a second sub-product; and (B) combining the first sub-product and the second sub-product to produce urea.    USE - The method is useful for electrochemically producing urea.    ADVANTAGE - The method: provides urea in high yields (of 90-100% relative to a total of carbon-containing products); utilizes renewable carbon dioxide source by capturing existing atmospheric carbon dioxide; is energy efficient, economical and environment friendly; and has improved control over the reaction process, suitable for commercial systems.    DETAILED DESCRIPTION - Electrochemical production of urea comprises either: (A) introducing carbon dioxide and nitrogen oxides to a solution of an electrolyte and a heterocyclic catalyst in an electrochemical cell, where (i) the electrochemical cell includes an anode in a first cell compartment and a cathode in a second cell compartment and (ii) the cathode reduces the carbon dioxide into a first sub-product and the nitrogen oxides into a second sub-product, and (B) combining the first sub-product and the second sub-product to produce urea; or step (A) and (B) as above per se, and (C) varying a yield of urea by adjusting at least one of (a) a material of the cathode, (b) a type of the heterocyclic catalyst, (c) an electrical potential of the cathode or (d) a type of the electrolyte. An INDEPENDENT CLAIM is also included for a system (100) for electrochemical production of urea comprising: an electrochemical cell including a first cell compartment, an anode positioned within the first cell compartment, a second cell compartment, a separator interposed between the first cell compartment and the second cell compartment, where the first cell compartment and the second cell compartment each contains an electrolyte, and a cathode and a heterocyclic catalyst positioned within the second cell compartment; a carbon dioxide source coupled with the second cell compartment where the carbon dioxide source is configured to supply carbon dioxide to the cathode; a nitrogen oxides source coupled with the second cell compartment, where the nitrogen oxides source is configured to supply nitrogen oxides to the cathode; a fluid source coupled with the first cell compartment; and an energy source operably coupled with the anode and the cathode, where the energy source is configured to provide power to the anode and the cathode, to reduce carbon dioxide at the cathode to a first sub-product, to reduce nitrogen oxides at the cathode to a second sub-product and to oxidize the fluid at the anode, and the product mixture is configured to combine to form urea.    DESCRIPTION OF DRAWING(S) - The figure shows a block diagram of a system for electrochemical production of urea.    System (100)    Cell (102)    Liquid source (104)    Power source (106)    Gas source (108)