Abstract
The mutual destabilization between complex hydrides and lithium amide has been comprehensively reported. In this paper, CeH 2 doped Li-Mg-N-H/NaAlH 4 composite was successfully synthesized by ball milling Li-Mg-N-H mixture and NaAlH 4 in a molar ratio of 1:2. It was found that a total of 5 wt.% of hydrogen could be desorbed from the newly synthesized composite with a three-step reaction. Temperature-programmed-desorption (TPD) measurements showed that the composite ball milled for 10 min began to desorb hydrogen below 100 °C, which was about 75 °C lower than the pristine materials. XRD analysis revealed that NaAlH 4 firstly reacted with LiH to yield Na 2LiAlH 6 and Al below 150 °C, then the newly developed Na 2LiAlH 6 reacted with Mg(NH 2) 2 to form NaH, Al, and Li 2MgN 2H 2 in the temperature range of 180-250 °C. From 200 to 300 °C, the newly formed Al and Li 2MgN 2H 2 reacted further to form Li 2NH and some stable phase (AlN and Mg 3N 2). The H-cycling properties of the composite were further investigated by a standard Sievert's type apparatus at 150, 200 and 250 °C, respectively. Finally, the reversibility of the newly synthesized composite was discussed.
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