Ru掺杂MoS2对SO2F2和H2S气体吸附的第一性原理研究

本文基于第一性原理探讨了Ru掺杂的单层MoS₂(Ru-MoS₂)的结构及其对SF₆绝缘设备中的两种主要分解气体SO₂F₂和H₂S的传感和吸附行为。Ru原子进入硫空位从而产生Ru-MoS₂,结果表明，Ru-MoS₂对SO₂F₂和H₂S气体的吸附能(E_ad)分别为-1.52和-2.11 eV,属于化学吸附。通过能带分析(BS)和态密度(DOS)分析进一步证明了两个体系的吸附性能，并阐述了Ru-MoS₂用于电阻式气体传感器时的气体吸附传感机制。除此之外，本文在理论上探索了不同温度下Ru-MoS₂解吸附SO₂F₂和H₂S的恢复时间，在598 K温度下，SO₂F₂吸附体系的恢复时间为6...

First-Principles Study of Adsorption of SO2F2 and H2S on the Ru Doped MoS2

The sensing and adsorption behaviors of Ru-doped MoS₂ monolayer (Ru-MoS₂) on the two main decomposition gases SO₂F₂ and H₂S in SF₆ insulated equipment were investigated based on the first-principles. Ru atoms were doped in sulfur vacancies to create Ru-MoS₂ monolayer. The results show that the adsorption energy (E_ad) of the SO₂F₂ and H₂S adsorption systems are -1.52 eV and -2.11 eV, respectively, indicating that both systems are classified as chemisorption. Band structure(BS) and density of states(DOS) analyses further demonstrate the adsorption properties of both systems, and the gas adsorption sensing mechanism of single-layer Ru-MoS₂ used in resistance gas sensor is described. In addition, the recovery time of Ru-MoS₂ monolayer for the desorption of SO₂F₂ and H₂S was explored theoretically at different temperatures, and the recovery time of SO₂F₂ adsorption system is 6.40 s at 598 K, demonstrating the recoverability of this novel material for gases at high temperatures. This study provides a theoretical basis for Ru-MoS₂ to detect the two main decomposition gases SO₂F₂ and H₂S in SF₆ insulation equipment, which is essential to promote the stable operation of power systems.