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Abstract
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| Sulphides containing only (or mainly) octahedral cations have been used relatively scarcely in visible light photocatalysis, furthermore, their spectral response in this latter process was never checked. Here we show that nanocrystalline In2S3 and SnS2, synthesized via hydrothermal methods and having bandgaps of 2.1 and 2.2 eV respectively, are photocatalysts for the oxidation of aqueous HCOOH able to use visible light until wavelengths above 600 nm, being in this process more photoactive and photocorrosion-resistant than the widely studied (and toxic) CdS. Furthermore, it is shown that heavily doping these sulphides with vanadium extends their spectral response to longer wavelengths; actually, in the In2S3-based case, this allows obtaining photocatalytic activity in the whole range of the visible light spectrum. This agrees with previous quantum mechanical calculations of ours (P. Palacios et al., Phys. Rev. Lett. 101, 046403, 2008; P. Wahnón et al., PCCP 13, 2011, 20401), which predict for these doped materials an intermediate band electronic structure that allows coupling the absorption of two sub-bandgap photons to achieve the photoexcitation of one electron across the full bandgap | |
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International
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Si |
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Congress
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E-MRS Spring Meeting - Symposium: S (Novel materials for hetereogeneous catalysis) |
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960 |
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Place
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Estrasburgo, Francia |
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Reviewers
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Si |
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ISBN/ISSN
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000-0000-000-000 |
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Start Date
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14/05/2012 |
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End Date
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18/05/2012 |
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From page
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1 |
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To page
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2 |
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Proc. E-MRS Spring Meeting |