Formation of CaB6 in the thermal decomposition of the hydrogen storage material Ca(BH4)2

2016-07-20 | Zeitschriftenartikel; Forschungsarbeit

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​Formation of CaB6 in the thermal decomposition of the hydrogen storage material Ca(BH4)2​
Sahle, C. J.; Sternemann, C.; Giacobbe, C.; Yan, Y.; Weis, C.; Harder, M. & Forov, Y. u.a.​ (2016) 
Physical Chemistry, Chemical Physics18(29) pp. 19866​-19872​.​ DOI: https://doi.org/10.1039/c6cp02495e 

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Autor(en)
Sahle, Christoph J.; Sternemann, Christian; Giacobbe, Carlotta; Yan, Yigang; Weis, Christopher; Harder, Manuel; Forov, Yury; Spiekermann, Georg; Tolan, Metin ; Krisch, Michael; Remhof, Arndt
Zusammenfassung
Using a combination of high resolution X-ray powder diffraction and X-ray Raman scattering spectroscopy at the B K- and Ca L2,3-edges, we analyzed the reaction products of Ca(BH4)2 after annealing at 350 °C and 400 °C under vacuum conditions. We observed the formation of nanocrystalline/amorphous CaB6 mainly and found only small contributions from amorphous B for annealing times larger than 2 h. For short annealing times of 0.5 h at 400 °C we observed neither CaB12H12 nor CaB6. The results indicate a reaction pathway in which Ca(BH4)2 decomposes to B and CaH2 and finally reacts to form CaB6. These findings confirm the potential of using Ca(BH4)2 as a hydrogen storage medium and imply the desired cycling capabilities for achieving high-density hydrogen storage materials.
Erscheinungsdatum
20-Juli-2016
Zeitschrift
Physical Chemistry, Chemical Physics 
eISSN
1463-9084
Sprache
Englisch

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