Lithium Incorporation into Titanium Dioxide Films from a Propylene Carbonate Solution: A Photoelectrochemical Study
Authors: Churikov, A. V.; Zobenkova, V. A.; Gamayunova, I. M.
Source: Russian Journal of Electrochemistry, Volume 40, Number 1, January 2004 , pp. 105-108(4)
Publisher: MAIK Nauka/Interperiodica
Abstract:Photoelectrochemical behavior of thin-film TiO2 electrodes produced by chemical and electrochemical oxidation of a titanium substrate is studied at potentials corresponding to the domain of active incorporation/extraction of lithium in an LiClO4 solution in propylene carbonate (1.0 V < E < 2.5 V vs. Li/Li+) and the inert domain (2.6 V < E < 3.6 V). Spectral and current–voltage characteristics are obtained for the photocurrent of TiO2- and LixTiO2-electrodes, which show n-semiconductor properties, in particular, generate an anodic (hole) photocurrent under illumination. The disappearance of the anodic photocurrent and the onset of a small cathodic photocurrent correlate with the beginning of active incorporation of lithium into the source oxide. The photosensitivity of intercalate LixTiO2 in the studied domain of spectrum is low and decreases with increasing lithium concentration. A photoeffect is discovered in the long-wave domain of spectrum beyond the limits of intrinsic absorption of a solid. The photocurrent is described by a characteristic exponential spectral curve.
Document Type: Research Article
Affiliations: Saratov State University, ul. Astrakhanskaya 83, Saratov, 410026 Russia
Publication date: 2004-01-01