Hydrogen Desorption in Mg(BH 4 ) 2 -Ca(BH 4 ) 2 System

Erika M. Dematteis and Marcello Baricco
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Erika M. Dematteis: Department of Chemistry and Inter-departmental Center Nanostructured Interfaces and Surfaces (NIS), University of Turin, Via Pietro Giuria 7, 10125 Torino, Italy
Marcello Baricco: Department of Chemistry and Inter-departmental Center Nanostructured Interfaces and Surfaces (NIS), University of Turin, Via Pietro Giuria 7, 10125 Torino, Italy

Energies, 2019, vol. 12, issue 17, 1-14

Abstract: Magnesium borohydride, Mg(BH 4 ) 2 , and calcium borohydride, Ca(BH 4 ) 2 , are promising materials for hydrogen storage. Mixtures of different borohydrides have been the subject of numerous researches; however, the whole Mg(BH 4 ) 2 -Ca(BH 4 ) 2 system has not been investigated yet. In this study, the phase stability and the hydrogen desorption were experimentally investigated in the Mg(BH 4 ) 2 -Ca(BH 4 ) 2 system, by means of XRD, ATR-IR, and HP-DSC. Mg(BH 4 ) 2 and Ca(BH 4 ) 2 are fully immiscible in the solid state. In the mechanical mixtures, thermal decomposition occurs at slightly lower temperatures than for pure compounds. However, they originate products that cannot be identified by XRD, apart from Mg and MgH 2 . In fact, amorphous phases or mixtures of different poorly crystalline or nanocrystalline phases are formed, leading to a limited reversibility of the system.

Keywords: complex hydrides; magnesium borohydride; calcium borohydride; hydrogen storage; phase diagram (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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