利用空间分辨拉曼光谱法测量 LiBH4 中的氢示踪剂扩散。
Hydrogen tracer diffusion in LiBH4 measured by spatially resolved Raman spectroscopy.
机构信息
Empa, Swiss Federal Laboratories for Materials Testing and Research, Laboratory 138, Hydrogen & Energy, Uberlandstrasse 129, CH-8600 Dübendorf, Switzerland.
出版信息
Phys Chem Chem Phys. 2010 May 21;12(19):5061-6. doi: 10.1039/c000229a. Epub 2010 Mar 29.
The hydrogen tracer diffusion in LiBH(4) has been determined by spatially resolved Raman spectroscopy. The measurements give direct evidence of a macroscopic diffusion of BH ions as well as atomic exchange of hydrogen between the anions. An effective tracer diffusion coefficient of deuterium in LiBH(4) of D approximately 7 x 10(-14) m(2) s(-1) at 473 K is derived. The direct exchange rate of hydrogen between BH(4) units is 10 orders of magnitude slower, i.e. the relatively fast effective hydrogen diffusion has its origin in the fast diffusion of BH(4) units.
通过空间分辨拉曼光谱法测定了 LiBH(4)中的氢示踪扩散。测量结果直接证明了 BH 离子的宏观扩散以及阴离子之间的氢原子交换。在 473 K 时，LiBH(4)中氘的有效示踪扩散系数 D 约为 7×10(-14)m(2)s(-1)。BH(4)单元之间氢的直接交换速率慢 10 个数量级，即相对较快的有效氢扩散源于 BH(4)单元的快速扩散。
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