Aun (n=1-4) cluster doped MoSe2 nanosheet as a promising gas-sensing material for C2H4 gas in oil-immersed transformer

In the long running of oil-immersed transformers, it is inevitable for the oil and insulating paper in transformers to decompose, which can lead to degradation of their insulation performance. Moreover, without timely detection to deal with the equipment failure, electric discharge occurs in transformers, which will affect the stability and security of the whole power system. In this paper, MoSe2 modified by Au and its cluster are proposed to adsorb both single and double C2H4 gas molecules, one of the typical decomposition products of the oil and paper in transformers. Based on DFT, adsorption systems were built and analyzed by analyzing adsorption parameters, DOS, and molecular orbit. The adsorption ability to single C2H4 molecule is in order as: Au-3 > Au-2 > Au > Au-4, and Au-4 > Au-3 > Au-2 > Au to double C2H4 molecules. Moreover, After C2H4 adsorption, the conductivity of Au and Au-4 doped systems enhances, while that of Au-2 and Au-3 systems reduces for both single and double C2H4 adsorption systems. According to the results, Au-3-MoSe2 can be a promising material as C2H4 adsorbent and gas sensor applied in detecting and diagnosing the discharge fault in oil-immersed transformers.

Automated summary

The study proposes a new MoSe2 material modified by Au, which can effectively adsorb the decomposition product C2H4 gas in oil-immersed transformers, potentially used for detecting and diagnosing discharge faults.