Ionic mobilities in amorphous anodic titania

H. Habazaki, K. Shimizu, Shinji Nagata, P. Skeldon, G. E. Thompson, G. C. Woodd

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)

Abstract

The mobilities of various electrolyte-derived species in amorphous anodic titania have been determined, with stabilization of the oxide structure by incorporation of silicon species from a sputter-deposited Ti-6 atom % Si alloy. From comparison of the distributions of silicon marker species and electrolyte-derived species in films formed at high current efficiency, boron, chromium, molybdenum, and tungsten species migrate outward more slowly than do Ti4+ ions. Their migration rates, relative to that of Ti4+ ions, correlate well with the energies of the respective metal-oxygen bonds. Further, chromium species incorporated into the film from chromate electrolyte are mainly present in the trivalent state, indicating reduction of Cr6+ ions to Cr3+ ions in the growing anodic oxide. This reduction of chromium species can be explained by considering the influences of Cr3+ and Cr6+ ions on the band structure of titania.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume149
Issue number3
DOIs
Publication statusPublished - 2002 Mar 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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