【摘 要】
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Metal borohydrides have been regarded as potential candidates for onboard hydrogen storage owing to its extremely high hydrogen density [1].A typical example Mg(BH4)2 possessing 14.9 mass% of hydrogen
【出 处】
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The 3rd International Symposium on Rare Earth Resource Utili
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Metal borohydrides have been regarded as potential candidates for onboard hydrogen storage owing to its extremely high hydrogen density [1].A typical example Mg(BH4)2 possessing 14.9 mass% of hydrogen, has been found to form by hydrogenation of MgB2 at 673 K under 95.0 MPa of hydrogen for 5 days [2].In this study, we investigated the hydrogenation properties of nanostructured MgB2 obtained by mechanical milling at room temperature under 1.0 Mpa of hydrogen.The total hydrogen concentration in MgB2 increased with increasing milling duration, and reached approximately1.0 mass% at 600 min.The interlayer distance between Mg and B layers did not change regardless of milling duration, suggesting that no hydrogen atom was inserted into interlayer.Furthermore, the reduced crystallite size suggests an increase in the volume fraction of grain boundary defects with the milling duration.Therefore, hydrogenis assumed to form B-H covalent bonds and/or Mg-H bonds in the grain boundary defects of nanostructured MgB2.Moreover, nanostructure significantly promotes the high pressure (40.0 Mpa) hydrogenation of MgB2 that led to the formation of Mg(BH4)2 [3].These findings proves that nanostructure is a key factor responsible for promoting the hydrogenation of MgB2 to Mg(BH4)2.
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