The hydrogen desorption pathways and storage properties of 2 Mg(NH 2 ) 2 –3 LiH–xLiBH 4 samples (x=0, 1, 2, and 4) were investigated systematically by a combination of pressure composition isotherm (PCI), differential scanning calorimetric (DSC), and volumetric release methods. Experimental results showed that the desorption peak temperatures of 2 Mg(NH 2 ) 2 –3 LiH–xLiBH 4 samples were approximately 10–15 °C lower than that of 2 Mg(NH 2 ) 2 –3 LiH. The 2 Mg(NH 2 ) 2 –3 LiH–4 LiBH 4 composite in particular began to release hydrogen at 90 °C, thereby exhibiting superior dehydrogenation performance. All of the LiBH 4 -doped samples could be fully dehydrogenated and re-hydrogenated at a temperature of 143 °C. The high hydrogen pressure region (above 50 bar) of PCI curves for the LiBH 4 -doped samples rose as the amount of LiBH 4 increased. LiBH 4 changed the desorption pathway of the 2 Mg(NH 2 ) 2 –3 LiH sample under a hydrogen pressure of 50 bar, thereby resulting in the formation of MgNH and molten [LiNH 2 –2 LiBH 4 ]. That is different from the dehydrogenation pathway of 2 Mg(NH 2 ) 2 –3 LiH sample without LiBH 4 , which formed Li 2 Mg 2 N 3 H 3 and LiNH 2 , as reported previously. In addition, the results of DSC analyses showed that the doped samples exhibited two independent endothermic events, which might be related to two different desorption pathways.

Effects of Stoichiometry on the H 2 -Storage Properties of Mg(NH 2 ) 2 –LiH–LiBH 4 Tri-Component Systems / Wang, Han; Cao, Hujun; Pistidda, Claudio; Garroni, Sebastiano; Wu, Guotao; Klassen, Thomas; Dorheim, Martin; Chen, Ping. - In: CHEMISTRY - AN ASIAN JOURNAL. - ISSN 1861-4728. - 12:14(2017), pp. 1758-1764. [10.1002/asia.201700287]

Effects of Stoichiometry on the H 2 -Storage Properties of Mg(NH 2 ) 2 –LiH–LiBH 4 Tri-Component Systems

Garroni, Sebastiano;
2017-01-01

Abstract

The hydrogen desorption pathways and storage properties of 2 Mg(NH 2 ) 2 –3 LiH–xLiBH 4 samples (x=0, 1, 2, and 4) were investigated systematically by a combination of pressure composition isotherm (PCI), differential scanning calorimetric (DSC), and volumetric release methods. Experimental results showed that the desorption peak temperatures of 2 Mg(NH 2 ) 2 –3 LiH–xLiBH 4 samples were approximately 10–15 °C lower than that of 2 Mg(NH 2 ) 2 –3 LiH. The 2 Mg(NH 2 ) 2 –3 LiH–4 LiBH 4 composite in particular began to release hydrogen at 90 °C, thereby exhibiting superior dehydrogenation performance. All of the LiBH 4 -doped samples could be fully dehydrogenated and re-hydrogenated at a temperature of 143 °C. The high hydrogen pressure region (above 50 bar) of PCI curves for the LiBH 4 -doped samples rose as the amount of LiBH 4 increased. LiBH 4 changed the desorption pathway of the 2 Mg(NH 2 ) 2 –3 LiH sample under a hydrogen pressure of 50 bar, thereby resulting in the formation of MgNH and molten [LiNH 2 –2 LiBH 4 ]. That is different from the dehydrogenation pathway of 2 Mg(NH 2 ) 2 –3 LiH sample without LiBH 4 , which formed Li 2 Mg 2 N 3 H 3 and LiNH 2 , as reported previously. In addition, the results of DSC analyses showed that the doped samples exhibited two independent endothermic events, which might be related to two different desorption pathways.
2017
Effects of Stoichiometry on the H 2 -Storage Properties of Mg(NH 2 ) 2 –LiH–LiBH 4 Tri-Component Systems / Wang, Han; Cao, Hujun; Pistidda, Claudio; Garroni, Sebastiano; Wu, Guotao; Klassen, Thomas; Dorheim, Martin; Chen, Ping. - In: CHEMISTRY - AN ASIAN JOURNAL. - ISSN 1861-4728. - 12:14(2017), pp. 1758-1764. [10.1002/asia.201700287]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11388/220395
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