Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 115, Issue 7, Pages 3143-3150Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp1080093
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Funding
- EPSRC [EP/F00270X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F00270X/1] Funding Source: researchfish
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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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