Structure of sol-gel made CeO2-TiO2 and relation with electrochemical insertion of lithium

D. Keomany; J. P. Petit; Daniel Deroo

doi:10.1117/12.185379

9 September 1994 Structure of sol-gel-made CeO₂-TiO₂ and relation with electrochemical insertion of lithium

D. Keomany, J. P. Petit, Daniel Deroo

Proceedings Volume 2255, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII; (1994) https://doi.org/10.1117/12.185379
Event: Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, 1994, Freiburg, Germany

Abstract

Thin films of CeO₂-TiO₂ have been prepared by a sol-gel process involving 2 alcoxides (Ce(OBu²)₄ and Ti(OBuⁿ)₄ in BuOH). The films are formed in an amorphous matrix of titanium oxide including nanocrystallites of cerium oxide whose size increases considerably (10 to 50 angstroms) for compositions with more than 50% CeO₂ in the film. The voltammetric data are in perfect concordance with the structural model previously described and deduced from X-ray Scattering: (i) the TiO₂ amorphous matrix accepts only a small amount of lithium up to the ITO reduction limit. The lithium ion mores in this matrix with a mobility similar to that of lithium in TiO₂ on its own. (ii) in the presence of very small separate grains of CeO₂ equivalent to pinpoint sites, the lithium passes through the TiO₂ matrix and occupies these pinpoint sites very quickly according to a homogeneous diffusion process in very small particles. This behavior appears for low values of CeO₂ contents. The global mobility should be close to that of Li⁺ in TiO₂. (iii) when the grain size increases, CeO₂ occupation of sites in the grain bulk is not instantaneous: the behavior of the intercalation in CeO₂ tends to the semi-infinite diffusion mode. On the other hand, TiO₂ content decreases, reducing the possible paths necessary to reach the deepest CeO₂ grains. The global mobility of Li⁺ will decrease for these 2 reasons and reaches that of Li⁺ in pure CeO₂.

Citation Download Citation

D. Keomany, J. P. Petit, and Daniel Deroo "Structure of sol-gel-made CeO₂-TiO₂ and relation with electrochemical insertion of lithium", Proc. SPIE 2255, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, (9 September 1994); https://doi.org/10.1117/12.185379

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available