Ru-InN Monolayer as a Gas Scavenger to Guard the Operation Status of SF6 Insulation Devices: A First-Principles Theory

SF ₆ insulation devices are important components in the power system, wherein the SF ₆ acts as the insulating gas protecting the operation state of devices effectively. However, the inevitable decomposition of SF ₆ under partial discharge in a long-running device would deteriorate the insulation property of SF ₆ largely. In this paper, we investigate the application of a Ru-doped InN (Ru-InN) monolayer as a novel gas adsorbent scavenging SF ₆ decomposed species based on a first-principles theory. Results indicate that the Ru-InN monolayer possesses quite strong adsorption behaviors upon three SF ₆ decomposed gases: SO ₂ , SOF ₂ , and SO ₂ F ₂ , wherein chemisorption can be identified. This allows exploration of the Ru-InN monolayer-based adsorbent for removing pollutant gases from SF ₆ insulation devices. Meanwhile, giving the obvious changes in conductivity of the Ru-InN monolayer caused by gas adsorption, the exploration of gas sensor using the Ru-InN monolayer would also be a means to evaluate the operation status of SF ₆ insulation devices. Our investigation indicates that the Ru-InN monolayer can be a good candidate for sensing or adsorbing to prevent paralysis of a power system caused by SF ₆ decomposition.