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 ultra-high 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 dehdrogenation of the LiBH4 +MgH2 system in the future.
Revised: April 7, 2011 |
Published: April 6, 2009
Citation
Hu J.Z., J. Kwak, Z. Yang, X. Wan, and L.D. Shaw. 2009.Direct Observation of Ion Exchange in Mechanically Activated LiH+MgB2 System Using Ultra-High Field Nuclear Magnetic Resonance Spectroscopy.Applied Physics Letters 94, no. 14:Art No.: 141905.PNNL-SA-62265.doi:10.1063/1.3110966