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Effect of transition metal fluorides on the sorption properties of the Ca(BH4)2 and Ca(BH4)2 + MgH2 composite system
Citation Link: https://doi.org/10.15480/882.1099
Other Titles
Der Einfluss von Übergangsmetall-Flouriden auf die Sorptionseigenschaften von Ca(BH4)2 und dem Komposithydrid Ca(BH4)2 + MgH2
Publikationstyp
Doctoral Thesis
Date Issued
2013
Sprache
English
Author(s)
Advisor
Title Granting Institution
Technische Universität Hamburg
Place of Title Granting Institution
Hamburg
Examination Date
2013-02-22
TORE-DOI
A comprehensive investigation of the effect of selected transition metal fluorides on the sorption properties of Ca(BH4)2 and Ca(BH4)2 + MgH2 composite system is performed in detail. A significant kinetic improvement upon (re)hydrogenation is achieved by addition of transition metal fluorides. Formation of transition metal boride nanoparticles is observed to be essential to promote heterogeneous nucleation of CaB6 during hydrogen desorption reaction. Formation of CaB12H12 limits the reversibility at the experimental conditions reported in this study.
In case of the Ca(BH4)2 + MgH2 composite system, the reversibility is achieved without further addition of additives. Mg acts as heterogeneous nucleation agent of CaB6 during decomposition of the Ca(BH4)2 + MgH2 composite system. The effect of the applied hydrogen pressure and temperature on the desorption reaction is studied. An assessment of the role of CaB12H12 during cycling and its counteractive effect upon (re)hydrogenation reaction is provided.
In case of the Ca(BH4)2 + MgH2 composite system, the reversibility is achieved without further addition of additives. Mg acts as heterogeneous nucleation agent of CaB6 during decomposition of the Ca(BH4)2 + MgH2 composite system. The effect of the applied hydrogen pressure and temperature on the desorption reaction is studied. An assessment of the role of CaB12H12 during cycling and its counteractive effect upon (re)hydrogenation reaction is provided.
Subjects
Wasserstoffspeicherung
Calcium Borhydrid
Magnesiumhydrid
11B Rotation im magischen Winkel Festkörper Kernspinresonanzspektroskop
Heterogene
hydrogen storage
calcium borohydride
magnesium hydride
11B MAS-NMR (Magic Angle Spinning–Nuclear Magnetic resonance)
hetero
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