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• W1578811745 startingPage "2235" @default.
• W1578811745 abstract "Changes in the optical absorption and electrical conductivity of dense and mesoporous anatase TiO2 films were measured in situ as a function of electrode potential during electrochemical lithium intercalation. A special two-electrode geometry was used for the conductivity measurements, in which the contacts were separated by a small gap bridged by the TiO2. When electrons are injected, an accumulation layer is formed and the conductivity increases several orders of magnitude. A monotonic increase of the optical absorption with wavelength confirms the presence of (partially) delocalized electrons. Insertion of lithium ions results in the formation of the Li0.5TiO2 phase and a decrease of the overall conductance. The specific conductivity of the Li0.5TiO2 phase is (9.1±0.2) S/cm, significantly lower than that of Li-doped anatase TiO2. This is corroborated by the absorption spectrum of Li0.5TiO2, which shows two pronounced peaks around 440 and 725 nm and no characteristic free-electron features. At potentials below 1.7 V vs Li additional lithium could be inserted into Li0.5TiO2, and the conductance was found to increase again. The results are discussed in terms of possible changes in the electronic structure that are induced by the insertion of lithium ions." @default.
• W1578811745 created "2016-06-24" @default.
• W1578811745 creator A5023524446 @default.
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• W1578811745 date "2001-09-01" @default.
• W1578811745 modified "2023-09-23" @default.
• W1578811745 title "Electrical and optical properties of TiO2 in accumulation and of lithium titanate Li0.5TiO2" @default.
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• W1578811745 doi "https://doi.org/10.1063/1.1388165" @default.
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