Plasmon-Induced CO<sub>2</sub> Conversion on Al@Cu<sub>2</sub>O: A DFT Study
Tien Le, Yihan Shao, Bin Wang
Abstract
In plasmonic catalysis, localized surface plasmons can be leveraged to drive chemical reactions. This approach is promising for catalyzing many challenging reactions at relatively low temperatures and pressures. We apply density functional theory calculations to provide an insight into the mechanism of plasmon-induced direct CO2 dissociation on an Al@Cu2O core–shell structure, which was observed in a previous experimental study. We show that the interaction of Cu2O with CO2 results in accessible antibonding states of the adsorbed CO2 in the range of visible light. Although the intrinsic activation barrier for direct CO2 dissociation is as high as 3.6 eV, we find that an effective reaction barrier of CO2 dissociation under photon excitation could be reduced by 2 eV. We also show that the charge transfer is more pronounced in the final state of dissociation due to the strong hybridization of the dissociated species with Cu2O. These results thus provide an explanation for the visible-light-induced direct CO2 dissociation at relatively low temperatures and under ambient pressure. The findings also show the promising role of plasmonic catalysis in mitigating carbon emission.