Single atom Pt supported by two-dimensional transition metal dichalcogenides for photocatalytic removal of harmful gases: A density functional theory study

Abstract

Two-dimensional transition metal dichalcogenides (TMDs) has a broad application prospect in photocatalytic removal of harmful gases, but it is limited by the slow carrier separation efficiency. In order to improve the slow carrier dynamics, loading the TMDs with trace precious metals is an effective strategy. Thanks to the presence of precious metals, the recombination of electron and hole is inhibited. In this paper, the photocatalytic removal potential of single atom Pt supported by TMDs for harmful gases was discussed. Specifically, using density functional theory, it was found that Pt@2H-MoS₂ and Pt@2H-MoSe₂ possessed moderate bandgap widths, excellent stability and light absorption ability. Using CO, NO, SO and SO₂ as model harmful gases, it was proved that Pt@2H-MoS₂ and Pt@2H-MoSe₂ can realize the photocatalytic removal of harmful gases by charge transfer and molecular orbital hybridization analysis. The above calculations exhibit that Pt@2H-MoS₂ and Pt@2H-MoSe₂ photocatalysts with excellent activity and stability possess broad prospects for the removal of harmful gases.