Figure 6

(a) The maximum number and the average adsorption energies of captured CO₂ molecules on negatively charged g-C₄N₃ with different charge densities. (b) Top and (c) side views of the lowest-energy configuration of six CO₂ molecules adsorbed on negatively charged g-C₄N₃ with charge density 61.7 × 10¹³ cm⁻².