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- W950974340 abstract "In this work the intercalation of sodium into V 2 O 5 thin films prepared by physical vapour deposition (PVD) on freshly cleaved highly ordered pyrolytic graphite (HOPG) substrates is studied by x-ray- and UV-induced photoelectron spectroscopy (XPS and UPS). The intercalated sodium strongly affects the electronic structure and causes a Fermi level shift of about 0.9eV. The core level spectra indicate a partial reduction of the V ions from the initial formal oxidation state V 5+ to the V 4+ state, due to electron transfer from the Na3s orbitals to V3d-like split-off states in the band gap. A saturation stoichiometry of Na 2 V 2 O 5 has been determined. For this composition a shift of the valence band maximum of about ΔE VBM =1.2eV and a decrease in the work function of ΔΦ=2.0eV has been observed. Further Na deposition leads to the adsorption of Na on the surface. The subsequent oxidation of the adsorbed Na is accompanied by a decomposition reaction of the host materials clearly indicated by the formation of V 3+ , V 2+ and V + species as also by the evolution of new valence band structures. Finally metallic sodium films are formed on the surface. A comparison of the data for the V 2 O 5 host and the stable intercalation compound Na 2 V 2 O 5 with metallic sodium as a reference results in a reversible discharging potential of about AV=0.9eV compared to an initial battery voltage of V max =3.4V. These values are in good agreement with data obtained from electrochemical measurements." @default.
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- W950974340 date "2003-03-12" @default.
- W950974340 modified "2023-10-18" @default.
- W950974340 title "A model for the correlation of solid state energies and potentials of sodium intercalated V2Os thin films with the battery voltage" @default.
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