Abstract
ESCA spectra of V2O5, V2O5/TiO2 and V2O5 dissolved in TiO2 were recorded after oxidation and reduction. V4+ ions have the same effective charge in reduced V2O5 and in TiO2, whereas the effective charge of V5+ ions in TiO2 is higher than in V2O5, indicating enhanced electron acceptor properties.
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