Desorption reaction in MgH2 studied with in-situ μ+SR
Desorption reaction in MgH2 studied with in-situ μ+SR
复制标题
使用原位 μ+SR 研究 MgH2 中的解吸反应
DOI：
10.1039/c8se00568k
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发表时间：
2019
影响因子：
5.6
通讯作者：
and J. H. Brewer
中科院分区：
文献类型：
--
作者：
J. Sugiyama;I. Umeagki;M. Matsumoto;K. Miwa;H. Nozaki;Y. Higuchi;T. Noritake;O. K. Forslund;M. Mansson;S. P. Cottrell;A. Koda;E. J. Ansaldo;and J. H. Brewer
为了研究决定储氢材料脱附温度(Td)的机制，我们测量了包括脱附温度在内的较宽温度范围内镁氢化物中的正Muon自旋自旋和弛豫(μ+SR)。在静态条件下，样品池中由解吸H2引起的压力与μ+SR测量平行测量。这种原位μ+SR测量表明，氢在远低于Td的氢气中开始扩散。这表明氢扩散通过从反应体系中去除反应产物H2来加速脱附反应的重要作用。
In order to study the mechanism determining the desorption temperature (Td) of hydrogen storage materials, we have measured positive muon spin rotation and relaxation (μ+SR) in MgH2 over a wide temperature range including its Td. The pressure in the sample cell due to desorbed H2 was measured in parallel with the μ+SR measurements under static conditions. Such in situ μ+SR measurements revealed that hydrogen starts to diffuse in MgH2 well below Td. This indicates the important role of hydrogen diffusion in accelerating the desorption reaction by removing the reaction product, i.e. H2, from the reaction system.