Online detection of insulation defects the decomposition products of SF₆ plays a key role in ensuring the safe operation of the gas-insulated switchgear (GIS) equipment. The pristine TiO₂ (1 0 1) modified by Ni cluster (1–3 Ni atoms) is used as a new gas-sensing material to study its gas-sensing characteristics to the characteristic decomposition products of SF₆: SO₂, SOF₂, and SO₂F₂. Through density functional theory (DFT) calculation, we found that the modification of Ni clusters significantly improved the conductivity of pristine TiO₂ (1 0 1) and the gas sensitivity of SF₆ decomposition products. More importantly, the change of conductivity after gas adsorption lays a theoretical foundation for identifying the type and concentration of SF₆ characteristic decomposition products and further judging the type of defects in GIS.

中文翻译：

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Ni团簇改性TiO2(1 0 1)对SF6分解气体的吸附性能

_{在线检测绝缘缺陷SF 6}的分解产物对确保气体绝缘开关设备（GIS）设备的安全运行起着关键作用。以 Ni 团簇（1-3 个 Ni 原子）修饰的纯 TiO _{2 (1 0 1) 作为新型气敏材料，研究其对 SF 6}特征分解产物的气敏特性：SO 2 _, SOF ₂ , 和 SO ₂ F ₂。通过密度泛函理论（DFT）计算，我们发现Ni团簇的修饰显着提高了原始TiO _{2 (1 0 1)的电导率和SF 6}的气敏性分解产物。_{更重要的是，气体吸附后电导率的变化为识别SF 6}特征分解产物的类型和浓度，进一步判断GIS缺陷类型奠定了理论基础。