Giant enhancement of hydrogen transport in rutile TiO2 at low temperatures

E. J. Spahr, L. Wen, M. Stavola, L. A. Boatner, L. C. Feldman, N. H. Tolk, G. Lüpke

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Abstract

Measurements of the O-H and O-D vibrational lifetimes show that the room-temperature hydrogen diffusion rate in rutile TiO2 can be enhanced by 9 orders of magnitude when stimulated by resonant infrared light. We find that the local oscillatory motion of the proton quickly couples to a wag-mode-assisted classical transfer process along the c channel with a jump rate of greater than 1 THz and a barrier height of 0.2 eV. This increase in proton transport rate at moderate temperatures provides new insight into hydrogen transport in solids, which could play a role in applications ranging from fuel cells to hydrogen production.

Original languageEnglish
Article number205901
JournalPhysical review letters
Volume104
Issue number20
DOIs
Publication statusPublished - May 21 2010

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Spahr, E. J., Wen, L., Stavola, M., Boatner, L. A., Feldman, L. C., Tolk, N. H., & Lüpke, G. (2010). Giant enhancement of hydrogen transport in rutile TiO2 at low temperatures. Physical review letters, 104(20), [205901]. https://doi.org/10.1103/PhysRevLett.104.205901