Highly-ordered magnéli Ti4O7nanotube arrays as effective anodic material for electro-oxidation

Ping Geng, Jingyang Su, Caroline Miles, Christos Comninellis, Guohua Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

62 Citations (Scopus)

Abstract

Pure Magnéli Ti4O7nanotube arrays (NTA) were successfully fabricated by reducing TiO2NTA with hydrogen at 850°C for 30 minutes. The microstructure, composition and electrochemical behavior of the prepared Ti4O7NTA 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 Ti4O7NTA 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 Ti4O7particles and Ti4O7NTA with the latter giving 20% more Chemical Oxygen Demand (COD) removal. Pure Ti4O7NTA 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 Ti4O7NTA as an anode.
Original languageEnglish
Pages (from-to)316-324
Number of pages9
JournalElectrochimica Acta
Volume153
DOIs
Publication statusPublished - 20 Jan 2015
Externally publishedYes

Keywords

  • Electro-oxidation
  • Magnéli titanium sub-oxides
  • Ti O 4 7
  • TiO nanotube arrays 2

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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