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arXiv 1108.0102cond-mat.mtrl-sci
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TiBx结构的加氢性能

Hydrogenation Properties of the TiBx Structures

R. Žitko, H. J. P. Van Midden, E. Zupanič, A. Prodan, S. S. Makridis, D. Niarchos, A. K. Stubos

摘要:

硼酸钛具有良好的储氢性能。利用密度泛函理论方法研究了许多氢化TiB 2、TiB和Ti 2 B结构的单个氢原子周围的结构弛豫和结合能。从可能的对称氢位点开始,除了定位所有能量稳定的吸附位点之外,还进行了随机结构搜索。结果表明,对于所考虑的三种本体化合物,TiB 2的结合能最低(在0.3-1.8 eV范围内),Ti 2B的结合能最大(在3.9-4.7 eV范围内),而TiB的结合能居中(在2.8-3.5 eV范围内)。氢化Ti 2B的计算结果在两个能量稳定的网站为两个不同的启动环境,这表明一个posible软模式的解决方案。

英文摘要:

Titanium borates show promissing hydrogen storage characteristics. Structural relaxation around individual hydrogen atoms and the binding energies are studied by means of the density functional theory methods for a number of hydrogenated TiB2, TiB and Ti2B structures. Starting with the possible symmetric hydrogen sites a random structure searching has been performed, in addition to locate all energetically stable adsorption sites. It is shown that for the three bulk compounds considered, the lowest binding energies are obtained for TiB2 (in the 0.3-1.8 eV range), the largest for Ti2B (in the 3.9-4.7 eV range), while for TiB they are intermediate (in the 2.8-3.5 eV range). Calculations performed on hydrogenated Ti2B result in two energetically stable sites for two different starting environments, suggesting a posible soft mode solution.

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