269 / 2021-11-08 11:40:24

Ni Doped C3N Monolayer: A Promising Adsorbent for SF6 Decomposition Component in GIS Equipment

High voltage and insulation technology > Sensing, monitoring and diagnostics

 As an excellent insulating medium, SF₆ is widely used in gas insulated switchgear (GIS). However, the long-term operation of the equipment will inevitably produce partial discharge, resulting in the decomposition of SF₆ and the deterioration of insulation performance. It can be used to detect the fault type and degree of the equipment, by detecting different composition and proportion of SF₆ decomposition components. Based on the first principle, the simulation is carried out by using the Dmol³ module in Materials Studio. The geometric structures of gas molecules and intrinsic C₃N were optimized. The adsorption and sensing properties of Ni doped C₃N (Ni-C₃N) for common decomposable components HF and SF₂ in SF₆ were studied. The results show that the gas sensing performance of C₃N is improved by doping Ni atoms. And Ni-C₃N has strong adsorption performance for SF₂ and weak adsorption performance for HF. When Ni-C₃N adsorbs SF₂, SF₂ has strong deformation and large adsorption energy. This paper provides an adsorption material with good adsorption performance for SF₂ gas, which provides a theoretical basis and design idea for C₃N based sensor with excellent gas sensing performance.