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a) LSV curves of Fe(a)@C‐Fe3O4/CNTs measured in Ar‐ and CO2‐saturated 0.1 M KNO3 electrolytes. b) The chronoamperometry curves of Fe(a)@C‐Fe3O4/CNTs measured in CO2‐saturated 0.1 M KNO3 with different potentials. c) The dependence of urea yield and FE of Fe@C‐Fe3O4/CNTs on potential. d) The stability test of Fe(a)@C‐Fe3O4/CNTs for urea synthesis.
