In the following we show that in cases where the SBP measurements by the two techniques deviate, it is possible t
The excellent insulating and arc extinguishing properties of sulfur hexafluoride (SF6) gas greatly improve the dielectric strength when used as an insulating medium. SF6 has been widely utilized in gas-insulated switchgear (GIS) [1�C4]. The reliability of GIS equipment is very high, however, its inevitable intrinsic defects continue to cause varying degrees of partial discharge (PD). Active gas produced by discharge accelerates insulation aging and corrosion of metal surfaces and may eventually lead to equipment failure. Many studies have shown that when a GIS insulation error occurs, the energy generated by discharge causes the SF6 gas to decompose and generate SF4, SF3, SF2, and various low-fluorine sulfides.
These low-fluoride sulfides react with trace moisture and the oxygen present in the SF6 gas and generate SOF4, SOF2, SO2F2, SO2, HF, and other compounds [5,6]. The common methods used at present to detect and analyze SF6 partial discharge decomposition products include gas chromatography and infrared absorption spectrometry, but all these methods are offline laboratory detection methods, and on-site detection with these methods is difficult to implement.Titanium dioxide nanotube arrays (TiO2NTs) are typical 3D nanomaterials that have numerous interesting physical and chemical properties. These materials are inexpensive and can thus be employed in numerous applications [7].
Studies have shown that compared with other nanostructure forms TiO2NTs have a large specific surface area and produce interesting nano-sized effects. TiO2NTs are utilized in photocatalysis, sensors, solar cells, etc. and exhibit a huge potential for development, having become one of the major topics in international GSK-3 nanomaterial research [8]. Miniature gas sensors prepared with TiO2NTs exhibit a fast response and high sensitivity. Several scholars have made great progress in this area in recent years, and TiO2NTs sensors are utilized to test for O2, NO2, H2, ethanol gas, etc. as sensitive materials [9�C11].A Pt-doped TiO2NTs gas sensor prepared through a pulsed electrochemical deposition method based on intrinsic TiO2NTs is developed in this study. The sensor’s capability to sense the major decomposition products of SF6 is evaluated.
Compared with the gas sensing properties of intrinsic TiO2NTs sensors, the Pt-doped nanoparticles change the gas sensing selectivity of the TiO2NTs sensor towards the main characteristic SF6 decomposition products.2.?Experimental Section2.1. Preparation of Pt-Doped TiO2NTsThe preparation of the Pt-doped TiO2NTs was based on electrochemical deposition on intrinsic TiO2NTs. The TiO2NTs were prepared by anodic oxidation [12]. With a conventional three-electrode system, Pt-doped nanoparticles were deposited onto TiO2NTs by pulsed electrodeposition.