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Melting Behavior and Thermolysis of NaBH 4 −Mg(BH 4 ) 2 and NaBH 4 −Ca(BH 4 ) 2 Composites

Author

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  • Morten B. Ley

    (Center for Materials Crystallography (CMC), Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, University of Aarhus, Langelandsgade 140, DK-8000 Århus C, Denmark)

  • Elsa Roedern

    (Center for Materials Crystallography (CMC), Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, University of Aarhus, Langelandsgade 140, DK-8000 Århus C, Denmark)

  • Peter M. M. Thygesen

    (Center for Materials Crystallography (CMC), Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, University of Aarhus, Langelandsgade 140, DK-8000 Århus C, Denmark)

  • Torben R. Jensen

    (Center for Materials Crystallography (CMC), Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, University of Aarhus, Langelandsgade 140, DK-8000 Århus C, Denmark)

Abstract

The physical properties and the hydrogen release of NaBH 4 –Mg(BH 4 ) 2 and NaBH 4 −Ca(BH 4 ) 2 composites are investigated using in situ synchrotron radiation powder X-ray diffraction, thermal analysis and temperature programmed photographic analysis. The composite, x NaBH 4 –(1 − x )Mg(BH 4 ) 2 , x = 0.4 to 0.5, shows melting/frothing between 205 and 220 °C. However, the sample does not become a transparent molten phase. This behavior is similar to other alkali-alkaline earth metal borohydride composites. In the x NaBH 4 –(1 − x )Ca(BH 4 ) 2 system, eutectic melting is not observed. Interestingly, eutectic melting in metal borohydrides systems leads to partial thermolysis and hydrogen release at lower temperatures and the control of sample melting may open new routes for obtaining high-capacity hydrogen storage materials.

Suggested Citation

  • Morten B. Ley & Elsa Roedern & Peter M. M. Thygesen & Torben R. Jensen, 2015. "Melting Behavior and Thermolysis of NaBH 4 −Mg(BH 4 ) 2 and NaBH 4 −Ca(BH 4 ) 2 Composites," Energies, MDPI, vol. 8(4), pages 1-13, April.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:4:p:2701-2713:d:47874
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    References listed on IDEAS

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    1. Pascal Schouwink & Morten B. Ley & Antoine Tissot & Hans Hagemann & Torben R. Jensen & Ľubomír Smrčok & Radovan Černý, 2014. "Structure and properties of complex hydride perovskite materials," Nature Communications, Nature, vol. 5(1), pages 1-10, December.
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