Giant enhancement of hydrogen transport in rutile TiO2 at low temperatures.
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.
Spahr
E J
EJ
Department of Applied Science, College of William and Mary, Williamsburg, Virginia 23187, USA.
Wen
L
L
Stavola
M
M
Boatner
L A
LA
Feldman
L C
LC
Tolk
N H
NH
Lüpke
G
G