Abstract
The SF6 decomposition components detection and elimination are crucial for preventing paralysis of the gas-insulated switchgear (GIS). In this work, Ru doped AlN monolayers with two doping strategies (Ru adatom and Ru substitution) are firstly investigated for selectively sensing and scavenging SF6 decomposition gases (SO2, SOF2, and SO2F2) based on first-principle theory. The most stable structures of Ru adatom and Ru substitution strategies are studied and named Ru-AlN-A and Ru-AlN-S, respectively. The adsorption calculation results show that Ru-AlN-A and Ru-AlN-S possess diacritical adsorption behaviors for SF6 decomposition species. Under the operating temperature, Ru-AlN-A monolayer can serve as the gas sensor or scavenger for selective detecting or removing SO2, SOF2, and SO2F2, whereas Ru-AlN-S monolayer can act as the gas scavenger or one-time gas sensor for SO2 and SOF2 due to the strong adsorption energies. Especially, the adsorption of SO2F2 by Ru-AlN-A makes SO2F2 decompose, while for SOF2, this phenomenon happens when adsorbed by Ru-AlN-S, which is insensitive to SO2F2. The above analysis suggests that Ru-AlN-A and Ru-AlN-S can be explored as novel gas sensors and sweepers for detecting and eliminating the SF6 decomposition species.
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