Fig. 3: Mechanism investigations of CO2RR on BDD and E-BDD.
From: Selective CO2 reduction to acetate via controlled sp2/sp3 carbon hybridization
a CO2-TPD of BDD, ELBDD, EMBDD and EHBDD. b In situ ATR-SEIRAS recorded at different applied potentials for the EMBDD in 0.1 M KHCO3 electrolyte. c The infrared spectra under alternating Ar and CO atmospheres. After CO is fully adsorbed (t = 0 s), the gas is switched to Ar, followed by pulsing with Ar-saturated electrolyte. Once the CO signal completely disappears (t = 90 s), the gas is switched back to CO, and pulsing is performed with CO-saturated electrolyte. d Free energy diagram for CO2 reduction reaction on E-BDD sp3/sp2 surface. The orange line shows the more facile way while the green, yellow and blue lines represent the less favorable way. e A proposed reaction mechanism for the CO2RR to CH3COO− on different sp2-C and sp3-C heterostructures. Blue, sp3 phase; yellow, sp2 phase; red, oxygen; black, carbon; white, hydrogen. Source data are provided as a Source Data file.
