Fig. 3: Electrocatalytic performance of urea synthesis on NC and Cu1/NC.
From: Sequential co-reduction of nitrate and carbon dioxide enables selective urea electrosynthesis

a, b The FEs of urea and the N-selectivity of all N-containing products under different potentials on NC (a) and Cu1/NC (b). c Urea yield rates at different potentials. d Comparison of urea formation rate and FE between NC and other catalysts reported in the literatures, including Fe + Fe3O4 at carbon nanotubes (Fe, Fe3O4/CNT)71, In(OH)314, oxygen-deficient InOOH (VO-InOOH)72, F-doped carbon nanotubes (F-CNT)73, Cu97In374, phthalocyanine-based covalent organic framework (CoPc-COF)75, In2O3/Graphene76, and AuPd77. Corresponding values are tabulated in Supplementary Table 1. e Stability test of NC at −0.5 V versus RHE for 5 cycles. The inset shows that the colour of the solution reacted with diacetyl monoxime is almost identical during cycling.