Fig. 4: Photocatalytic CO2RR performances of the ultrathin PBOC layers and bulk PBCOC.

a Photocatalytic CO2RR products under full-spectrum light irradiation. b Photocatalytic CO2 reduction activities of the ultrathin PBOC in N2 (grey ball), atmospheric CO2 (red ball), and pure CO2 (blue ball) under full-spectrum light irradiation. c GC-MS spectrum of the products with 13CO2. d CO2RR cycling measurements under full-spectrum light irradiation for 4 h. Error bars are means ± standard deviation of three replicates.