Photoelectrochemistry and interfacial energetics of titanium dioxide photoelectrodes in fluoride-containing solutions

Mou Wang Chong, Thomas E. Mallouk

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

In a preliminary report, the authors described the photoelectrochemical production of fluorine from anhydrous hydrogen fluoride solutions using single-crystal TiO2 electrodes. It was found that fluorine doping substantially enhanced the stability of n-TiO2 photoelectrodes in HF/NaF. They now report a fuller characterization of these effects and a study of the energetics of the semiconductor/fluoride-containing solution interface by ac impedance techniques. This study reveals an extremely low density of midgap surface states, which allows the electrode to develop a large open circuit photovoltage and to evolve fluorine efficiently, and without substantial photoanodic corrosion, from anhydrous hydrogen fluoride solutions. This same low density of surface states, and a shift of the valence band-edge to more negative potentials, gives rise to a complete lack of photoactivity in fluoride-containing acetonitrile solutions.

Original languageEnglish
Pages (from-to)423-428
Number of pages6
JournalJournal of Physical Chemistry
Volume94
Issue number1
Publication statusPublished - 1990 Jan 1
Externally publishedYes

Fingerprint

photoelectrochemistry
Fluorides
titanium oxides
Titanium dioxide
fluorides
Fluorine
Hydrofluoric Acid
fluorine
hydrofluoric acid
Surface states
Hydrogen
Electrodes
electrodes
photovoltages
Valence bands
Acetonitrile
acetonitrile
corrosion
Doping (additives)
Single crystals

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

Cite this

Photoelectrochemistry and interfacial energetics of titanium dioxide photoelectrodes in fluoride-containing solutions. / Chong, Mou Wang; Mallouk, Thomas E.

In: Journal of Physical Chemistry, Vol. 94, No. 1, 01.01.1990, p. 423-428.

Research output: Contribution to journalArticle

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