A DFT study of planar: Vs. corrugated graphene-like carbon nitride (g-C₃N₄) and its role in the catalytic performance of CO₂ conversion

Graphene-like carbon nitride (g-C₃N₄), a metal-free 2D material that is of interest as a CO₂ reduction catalyst, is stabilised by corrugation in order to minimise the electronic repulsions experienced by the N lone pairs located in their structural holes. This conformational change not only stabilises the Fermi level in comparison with the totally planar structure, but also increases the potential depth of the π-holes, representing the active sites where the catalytic CO₂ conversion takes place. Finally, as a result of corrugation, our DFT-D3 calculations indicate that the reaction Gibbs free energy for the first H⁺/e^- addition decreases by 0.49 eV with respect to the totally planar case, suggesting that corrugation not only involves the material's stabilisation but also enhances the catalytic performance for the selective production of CO/CH₃OH.