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Exemplary HPLC chromatogram of samples of electrochemical urea synthesis of 0, 30, 60, and 120 min. (Reaction conditions: catholyte: 0.2 mol KHCO3+ 0.02 mol KNO2; anolyte: 0.1 mol H2SO4; catalyst: zinc; current density: 20 mA cm-2; electrode area: 25 cm2; electrolyte volume: 250 mL; and details of HPLC method are given in thesupplemental information).

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