Enhancement of Adsorption Performance of Gases in Oil on a Cr₃-Modified SnS₂ Monolayer Based on the First Principles

Dissolved gas analysis (DGA) is the most commonly used transformer fault diagnosis technology at present. In this paper, according to the method of first principles of density function theory (DFT), the gas-sensitive mechanisms of four oil-soluble characteristic gases (H₂, CO, C₂H₂, C₂H₄) on intrinsic SnS₂ and Cr₃-SnS₂ were studied. The adsorption energy and electron transfer were calculated, and the density of states, energy bands, and recovery times were analyzed. It was concluded that H₂ and C₂H₄ were physisorbed on the Cr₃-SnS₂ monolayer, while CO and C₂H₂ were chemisorbed. It is believed that the Cr₃-SnS₂ material can be used in gas sensing for CO and C₂H₂. Cr₃-SnS₂ is expected to serve as a gas detector for the detection of CO with both a good response and reusability. Therefore, Cr₃-SnS₂ has very promising applications in the evaluation of the operation of oil-immersed transformers. This study will provide some help and inspiration for the development of the Cr₃-SnS₂ monolayer in gas-sensitive materials.