Ni-Dispersed PdS<sub>2</sub> Monolayer as a Potential Sensing Material for Dissolved Gas Analysis in Electrical Transformers: A First-Principles Study
Jiaying Yu, Xiu Zhou, Hao Cui, Lei Chen, Ying Wei, Tian Tian
Abstract
High Resolution Image Download MS PowerPoint Slide To perform the dissolved gas analysis in transformer oil, in this work, we propose the Ni-dispersed PdS 2 (Ni-PdS 2 ) monolayer as a promising sensing material for three typical dissolved gases H 2, CO, and C 2 H 2 . For the Ni-dispersing process, we find that Ni atoms can be chemically stably adsorbed on the PdS 2 surface with a binding energy of −4.11 eV. For gas adsorption systems, it is found that the Ni-PdS 2 monolayer allows the physisorption of H 2 molecules and the chemisorption of CO and C 2 H 2 molecules. Besides, the analysis of electronic properties of the Ni-PdS 2 /gas system reveals its potential as a resistance-type H 2 or C 2 H 2 sensor with sensing responses of −40.9 and 261.5%, separately, and the WF analysis indicates its low potential as a WF-based gas sensor for the three gases. These findings indicate the Ni-dispersed behavior on the PdS 2 surface and the gas-sensing potential of the Ni-PdS 2 monolayer, which we expect can facilitate more investigations about PdS 2 -based materials for applications in gas adsorptions and sensing in some other fields.