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Li+ Ion Insertion in TiO2 (Anatase). 2. Voltammetry on Nanoporous Films
Open accessAbstract
Electrochemical properties of Li + ion insertion in nanoporous TiO 2 (anatase) electrodes were studied by voltammetry. Linear and cyclic potential scans were recorded as a function of electrolyte concentration, film thickness, and temperature. The currents were directly proportional to the inner electrode area of the electrodes. The reduction of Ti 4+ and oxidation of Ti 3+ are sluggish and follows irreversible kinetics. The standard rate constant was (3.5 ± 0.5) × 10 -10 cm/s. The transfer coefficient was close to 0.5, indicating that the potential drop appears mainly across the Helmholtz layer. The capacitive currents govern largely the shape of the i − v curves, except within a region near the peak potential where diffusion-limited insertion and extraction of Li + ions in the anatase lattice are dominating. The diffusion coefficient at 25 °C in the nanoporous structure was approximately 2 × 10 -17 cm 2 /s for insertion and 4 × 10 -17 cm 2 /s for extraction. The activation energy was 0.4 eV for insertion and 0.5 eV for extraction. The maximum obtained mole fraction of Li + in Li x TiO 2 was x = 0.47.
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Metadata
- Authors
- Lindström, H., Södergren, S., Solbrand, A., Rensmo, H., Hjelm, J., Hagfeldt, A., & Lindquist, S.-E.
- Venue
- The Journal of Physical Chemistry B
- Publisher
- American Chemical Society (ACS)
- Published
- 1997-09-01
- Volume
- 101
- Issue
- 39
- Pages
- 7717-7722
- ISSN
- 1520-5207 (ISSN-L)
- 1520-6106
- OpenAlex
- W1987494872
- Cited by
- 1,669
- References
- 0
- FWCI
- 3.02
- Type
- journal article
- Language
- en
- Open access
- green
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