Mossbauer Study of the Kinetics of Fe3+ Photoreduction on TiO2 Semiconductor Powders

J. D. Brown, D. L. Williamson, A. J. Nozik

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The kinetics of the photoreduction of Fe3+ to Fe2+ via illuminated TiO2 particles suspended in ferric chloride electrolyte has been studied by 57Fe Mössbauer spectroscopy. The semiconductor powder-liquid electrolyte slurry was quench-frozen after specific illumination periods to generate samples amenable to Mössbauer spectroscopy. The rates and equilibrium conversion of Fe3+ reduction were obtained for five TiO2 particle-electrolyte systems: (1) intrinsic anatase powder; (2) intrinsic rutile powder; (3) intrinsic anatase powder with a facile hole acceptor added to the electrolyte; (4) reduced, n-type anatase; and (5) platinized, n-type anatase powder. A simple kinetic model, based on competition between the forward reduction of Fe3+ and the back oxidation of Fe2+, and controlled by semiconductor band/redox couple energetics, is able to account for the observed differences in Fe3+ photoreduction for the five systems.

Original languageAmerican English
Pages (from-to)3076-3080
Number of pages5
JournalJournal of Physical Chemistry
Issue number14
StatePublished - 1985

Bibliographical note

Work performed by Department of Physics, Colorado School of Mines, Golden, Colorado, and Solar Energy Research Institute, Golden, Colorado

NREL Publication Number

  • ACNR/JA-212-6508


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