Co2 Activation and Dissociation Over Ag(111) Surfaces in the Presence of Surface Charge Density: A Static Gas Phase Dft Study

The CO2 reduction reaction pathways on Ag in the presence of surface plasmons are of strong interest in photocatalysis. Here, two Density Functional Theory (DFT) approaches are proposed to localize charges at the Ag surface to mimic surface plasmon excitation. These calculations predict charge localization at the outermost surface layer, a result confirmed via light excitation at the plasmon resonance modeled by Density Functional Tight Binding Hamiltonian (DFTB) theory. The CO2(gas) reduction is studied by DFT models showing that * CO2δ- bonded species can be created on top of an Ag-atom in the presence of extra charges. A second CO2 molecule can assist the first molecule, decreasing the charge carrier density requirement for CO2 reduction and the formation of *2CO2δ- bonded species. A Molecular Dynamics (MD) study shows a possible dissociation route: *2CO2δ- [[EQUATION]] *CO+CO3(gas) . These results demonstrate that a static DFT simulation can mimic charge localization resulting from surface plasmon effects, thus enabling studies on surface plasmon-enhanced chemical reactions, paving the way for future time-dependent (TD) studies.