Giant Enhancement of Hydrogen Transport in Rutile TiO2 at Low Temperatures

被引：43

作者：

Spahr, E. J. ^{[1
]}

Wen, L. ^{[2
]}

Stavola, M. ^{[2
]}

Boatner, L. A. ^{[3
]}

Feldman, L. C. ^{[4
,5
]}

Tolk, N. H. ^{[5
]}

Luepke, G. ^{[1
]}

机构：

[1] Coll William & Mary, Dept Appl Sci, Williamsburg, VA 23187 USA

[2] Lehigh Univ, Dept Phys, Bethlehem, PA 18015 USA

[3] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA

[4] Rutgers State Univ, Inst Adv Mat Devices & Nanotechnol, Piscataway, NJ 08854 USA

[5] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 20期

基金：

美国国家科学基金会;

关键词：

DIFFUSION; CRYSTALS; DEUTERIUM; SPECTRA; OXIDES;

D O I：

10.1103/PhysRevLett.104.205901

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：4

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