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Publication Detail
Mechanism of O-2 Production from Water Splitting: Nature of Charge Carriers in Nitrogen Doped Nanocrystalline TiO2 Films and Factors Limiting O-2 Production
  • Publication Type:
    Journal article
  • Publication Sub Type:
    JOUR
  • Authors:
    Tang JW, Cowan AJ, Durrant JR, Klug DR
  • Publication date:
    24/02/2011
  • Pagination:
    3143, 3150
  • Journal:
    Journal of Physical Chemistry C
  • Volume:
    115
  • Issue:
    7
  • Print ISSN:
    1932-7447
  • Keywords:
    VISIBLE-LIGHT PHOTOCATALYSIS, TRANSIENT ABSORPTION, SPECTROSCOPY, POWDERS, DYNAMICS, OXYGEN, IRRADIATION, REACTIVITY, PHOTOLYSIS, OXIDATION
  • Author URL:
  • Notes:
    Times Cited: 15 AMER CHEMICAL SOC 1155 16TH ST, NW, WASHINGTON, DC 20036 USA WASHINGTON Article 721FD English Cited References Count: 37 Tang, J. W UCL, Dept Chem Engn, London WC1E 6BT, England
Abstract
The low efficiency of the extensively investigated visible light photocatalyst N-TiO2 has been widely assumed to be determined by the dynamics of the charge carriers. The nature of the photoelectrons and photoholes produced on the nanostructured (nc) N-TiO2 film has been systematically investigated in this work by the use of time-resolved absorption spectroscopy. Here the fingerprints of the two distinct photohole populations on nc-N-TiO2 films are reported and the reaction between these photoholes and Water has been examined. The origin of the low efficiency of the visible-driven material for water oxidation was explored and rapid electron hole decay following visible excitation is believed to be a key factor. Pt deposition on nc-N-TiO2 resulted in an 80% enhancement of the quantum yield for O-2 production under UV light. Finally, it has been summarized that the oxygen production on the nc-N-TiO2 film requires photoholes with lifetimes of similar to 0.4s
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