Direct observation of ion exchange in mechanically activated LiH+MgB2 system using ultrahigh field nuclear magnetic resonance spectroscopy

Hu, Jian Zhi; Kwak, Ja Hun; Yang, Zhenguo; Wan, Xuefei; Shaw, Leon L.
April 2009
Applied Physics Letters;4/6/2009, Vol. 94 Issue 14, p141905
Academic Journal
The LiBH4+MgH2 system has great potential for hydrogen vehicle applications. In this study, the reported solid-state hydrogenation system made of LiH+1/2MgB2 has been investigated using ultrahigh field nuclear magnetic resonance spectroscopy. It is found that Mg–Li ion exchange occurs within MgB2 during ball milling to form a compound of (Mg1-xLi2x)B2, which facilitates the formation of LiBH4 in the subsequent hydriding reaction. This discovery offers a scientific foundation for investigating the detailed mechanisms of solid-state hydrogenation and dehydrogenation of the LiBH4+MgH2 system in the future.


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