Fig. 3

a ¹H-NMR spectrum of the electrolyte after 5 h of CO₂ electrolysis over Co-corrole–carbon paper electrode at −0.585, −0.7, −0.8, and −0.905 V vs. RHE in 0.1 M NaClO₄, pH = 6, phosphate buffer, and phenol as the internal standard in DMSO. b ¹³C-NMR (101 MHz, H₂O:D₂O = 5:1) of the electrolyte after 5 h of electrolysis at −0.8 V vs. RHE in ¹³CO₂, 0.1 M NaClO₄, pH = 6, phosphate buffer. c–f GC–MS spectrum of the electrolyte after bulk electrolysis at −0.8 V vs. RHE in ¹²CO₂ and ¹³CO₂: c ¹³C enriched ethanol, d ¹²C enriched ethanol, e ¹²C enriched methanol, and f ¹³C enriched methanol. g SEC-FTIR spectra during the CO₂ reduction with 20 mM Co-corrole in 0.1 M TBAPF₆ (in CH₃CN/H₂O = 4:1), at potentials from −0.3 to −1.9 V vs. NHE