Giant Enhancement of Hydrogen Transport in Rutile TiO2 at Low Temperatures
Giant Enhancement of Hydrogen Transport in Rutile TiO2 at Low Temperatures
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DOI：
10.1103/physrevlett.104.205901
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发表时间：
2010-05-21
影响因子：
8.6
通讯作者：
Luepke, G.
中科院分区：
文献类型：
--
作者：
Spahr, E. J.;Wen, L.;Luepke, G.
O-H和O-D振动寿命的测量结果表明，在共振红外光激发下，氢在金红石型TiO 2中的扩散速率可提高9个数量级。我们发现质子的局部振荡运动迅速耦合到一个wag模式辅助的经典转移过程沿着的c沟道跳跃率大于1太赫兹和0.2 eV的势垒高度。在中等温度下质子传输速率的增加为固体中的氢传输提供了新的见解，这可能在从燃料电池到制氢的应用中发挥作用。
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.