▎ 摘　　要

In this paper, using density functional theory, we studied the adsorption properties of four different structures of Pt-and N-doped graphene (Pt/xN-GN, x = 0,1,2,3) for SO2, the main decomposition product of SF6. In the Pt/xN-GN structure, with increasing N atom content, the adsorption distance of SO2 decreases and the adsorption energy increases. The total density of states and the partial density of states of the system before and after gas adsorption were compared and analyzed to explore the mechanism of the interaction between SO2 and the Pt/xN-doped graphene structure. Pt/3N-GN adsorbs SO2 gas molecules, and orbital hybridization occurs, which is chemical adsorption. Pt/3N-GN has good adsorption performance for SO2 gas molecules, and the adsorption energy is -2.548 eV. The gas sensor based on Pt/xN-doped graphene studied in this paper has good application prospects in the field of gas-insulated switchgear discharge decomposition component detection and fault diagnosis.