Sensing characteristics of black phosphorus on SF6 decomposition components based on the First-principle

SF6 is widely used as electrical insulating gas in power systems because of its strong insulating and arc extinguishing properties. However, due to partial discharges during actual operation, SF6 reacts to produce a series of by-products, typically SO2 and H2S, which can threaten the stability of equipment and even power systems, so it is necessary to monitor the decomposition of SF6 in real-time. In this paper, the adsorption properties of the two-dimensional material black phosphorus on the typical SF6 decomposition products SO2 and H2S, including adsorption energy, charge transfer and density of states function, are calculated based on the First-principle. The results show that black phosphorus has a certain adsorption effect on both SO2 and H2S, with more sensitivity to SO2, and has the potential to be used as a gas-sensitive material to prepare sensors for real-time monitoring of SF6 decomposition.