Pure Magnéli Ti 4 O 7 nanotube arrays (NTA) were successfully fabricated by reducing TiO 2 NTA with hydrogen at 850 °C for 30 minutes. The microstructure, composition and electrochemical behavior of the prepared Ti 4 O 7 NTA were characterized by means of X-ray Diffraction, Scanning Electron Microscopy, Transmission Electron Microscopy , X-ray Photoelectron Spectroscopy, Cyclic Voltammetry and Electrochemical Impedance Spectroscopy . The as-prepared Ti 4 O 7 NTA had a highly-ordered tubular structure with high crystallinity , large electrochemical window of water electrolysis (2.4 V vs. Ag/AgCl, pH = 6.0) and low interfacial charge transfer resistance when they were employed as anode for electro-oxidation. Phenol was electro-oxidized on Ti 4 O 7 particles and Ti 4 O 7 NTA with the latter giving 20% more Chemical Oxygen Demand (COD) removal. Pure Ti 4 O 7 NTA also displayed larger degradation coefficient as well as higher COD removal and current efficiency than Boron-doped Diamond and other types of Magnéli NTAs. Cathodic polarization was found to be an effective way of restoring the electrochemical performance of oxidized Ti 4 O 7 NTA as an anode.
Magnéli phase ceramics have gained extensive attention in a variety of fields, including batteries, electrocatalysis , and wastewater treatment, due to their distinctive properties. In this study, high-performance Magnéli phase Ti 4 O 7 ceramics were synthesized by in-situ hot-pressed sintering of titanium (Ti) and titanium dioxide (TiO 2 ) in a single step. The effects of the sintering temperature and Ti content on the phase transformation and morphology of ceramics were investigated. Moreover, the mechanical properties and electrical conductivity of the samples were systematically characterized. Results show that the sample with the Ti/TiO 2 weight ratio of 0.09 sintered at 1000 °C has impressive comprehensive properties, including a high bulk density of 4.281 g·cm −1 , a mean value of flexural strength of 125.58 MPa, and an excellent conductivity of 1129 S·cm −1 . Furthermore, an evolution mechanism of the in-situ sintering for Ti/TiO 2 was discussed based on the experimental data, and the pattern of variation observed by samples can be reasonably explained.
危险品化学品经营许可证（带存储）