Abstract
The detection of sulfur hexafluoride (SF6) decomposition components is significant for monitoring the conditions of SF6-gas-insulated equipment. In present study, the adsorption of SF6 and its decomposition components (H2S, SO2, SOF2, and SO2F2) on ceria (110) was investigated by performing calculations based on density functional theory (DFT). Adsorption energy, adsorption configuration, charge transfer, density of states, potential energy and work function for molecular adsorption were adopted to evaluate the performance of ceria (110) on sensing SF6 decomposition components. Among all the gas molecules, H2S, SO2 and SOF2 were chemically adsorbed on ceria surface with the adsorption energy following the order: SOF2 > SO2 > H2S, while SO2F2 and SF6 were physically adsorbed on the substrate. Besides, the amount of charge transfer and work function modification of H2S, SO2 and SOF2 molecule’s adsorption were larger than those of SO2F2 and SF6. These calculation results demonstrated ceria (110) showed prominent sensitivity to H2S, SO2 and SOF2 while less activity to SF6, which means sensor based on ceria is promising for detecting H2S, SO2 and SOF2 in SF6 gas background, and thus has the potential to online monitor the working condition of SF6-gas-insulated equipment.
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