Zhao Qi, Li Suya, He Jin, Man Yuyan, Li Songyuan
State Grid Tianjin Electric Power Research Institute, Tianjin 300384, China.
Tianjin Key Laboratory of Things in Electricity, Tianjin 300384, China.
Materials (Basel). 2024 Nov 10;17(22):5487. doi: 10.3390/ma17225487.
The online monitoring of transformer insulation is crucial for ensuring power system stability and safety. Dissolved gas analysis (DGA), employing highly sensitive gas sensors to detect dissolved gas in transformer oil, offers a promising means to assess equipment insulation performance. Based on density functional theory (DFT), platinum modification of a WTe monolayer was studied and the adsorption behavior of CO and CH on the Pt-WTe monolayer was simulated. The results showed that the Pt atom could be firmly anchored to the W atoms in the WTe monolayer, with a binding energy of -3.12 eV. The Pt-WTe monolayer showed a trend toward chemical adsorption to CO and CH with adsorption energies of -2.46 and -1.88 eV, respectively, highlighting a stronger ability of Pt-WTe to adsorb CO compared with CH. Analyses of the band structure (BS) and density of states (DOS) revealed altered electronic properties in the Pt-WTe monolayer after gas adsorption. The bandgap decreased to 1.082 eV in the CO system and 1.084 eV in the CH system, indicating a stronger interaction of Pt-WTe with CO, corroborated by the analysis of DOS. Moreover, the observed change in work function (WF) was more significant in CO systems, suggesting the potential of Pt-WTe as a WF-based gas sensor for CO detection. This study unveils the gas-sensing potential of the Pt-WTe monolayer for transformer status evaluation, paving the way for the development of gas sensor preparation for DGA.
变压器绝缘的在线监测对于确保电力系统的稳定性和安全性至关重要。溶解气体分析（DGA）采用高灵敏度气体传感器来检测变压器油中的溶解气体，为评估设备绝缘性能提供了一种很有前景的方法。基于密度泛函理论（DFT），研究了铂对WTe单层的改性，并模拟了CO和CH在Pt-WTe单层上的吸附行为。结果表明，Pt原子可以牢固地锚定在WTe单层中的W原子上，结合能为-3.12 eV。Pt-WTe单层对CO和CH表现出化学吸附趋势，吸附能分别为-2.46和-1.88 eV，突出了Pt-WTe对CO的吸附能力比CH更强。对能带结构（BS）和态密度（DOS）的分析表明，气体吸附后Pt-WTe单层的电子性质发生了改变。在CO体系中带隙降至1.082 eV，在CH体系中降至1.084 eV，这表明Pt-WTe与CO的相互作用更强，DOS分析证实了这一点。此外，在CO体系中观察到的功函数（WF）变化更为显著，这表明Pt-WTe作为基于WF的CO检测气体传感器具有潜力。本研究揭示了Pt-WTe单层在变压器状态评估方面的气敏潜力，为开发用于DGA的气体传感器制备铺平了道路。
