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

Author

Listed:
  • 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
    Université Paris Est, Institut de Chimie et des Matériaux Paris Est, ICMPE, CNRS-UPEC, F-94320 Thiais, France)

  • Marcello Baricco

    (Department of Chemistry and Inter-departmental Center Nanostructured Interfaces and Surfaces (NIS), University of Turin, Via Pietro Giuria 7, 10125 Torino, Italy)

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.

Suggested Citation

  • Erika M. Dematteis & Marcello Baricco, 2019. "Hydrogen Desorption in Mg(BH 4 ) 2 -Ca(BH 4 ) 2 System," Energies, MDPI, vol. 12(17), pages 1-14, August.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:17:p:3230-:d:259902
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