Hydrogen absorption–desorption cycle durability of SmMgNi4
Hydrogen absorption–desorption cycle durability of SmMgNi4
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DOI：
10.1016/j.jallcom.2014.09.033
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发表时间：
2015-02
影响因子：
6.2
通讯作者：
Z. Chen;T. Si;Q. Zhang
中科院分区：
文献类型：
--
作者：
Z. Chen;T. Si;Q. Zhang
本文系统研究了球磨-烧结法制备的SmMgNi 4化合物的可逆储氢性能及其结构特征与循环次数的关系。结果表明，Sm和Mg交换量为13%的SmMgNi 4合金具有良好的稳定性，多次循环后未发生氢致非晶化和相分解。然而，在298 K下，在氢吸/脱附循环的早期阶段仍然观察到约16%的容量损失。由位错的积累引起的晶格应变的增加被认为是SmMgNi 4的容量退化的原因。
The reversible hydrogen storage capacity and structural features against cycle numbers of SmMgNi4compound prepared by the combination of ball-milling with sintering are investigated systematically in this work. It is found that the structure of SmMgNi4with an exchange between Sm and Mg by 13% has a good stability without occurrence of hydrogen-induced amorphization and phase decomposition upon multiple cycling. However, about 16% capacity loss is still observed at the early stages of hydrogen ab-/desorption cycles at 298 K. The increase in lattice strain caused by the accumulation of dislocations is believed to be responsible for the capacity degradation of SmMgNi4.