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Effects of ball milling and TiF3 addition on the dehydrogenation temperature of Ca(BH$_{4}$)$_{2}$ polymorphs

Jansa, I. L.; Friedrichs, O.; Fichtner, M.; Gil Bardají, Elisa; Züttel, A.; Hauback, B. C.

The changes introduced by both ball milling and the addition of small amounts of TiF$_{3}$ in the kinetics of the hydrogen desorption of three different Ca(BH$_{4}$)$_{2}$ polymorphs (α, β and γ) have been systematically investigated. The samples with different polymorphic contents, before and after the addition of TiF3, were characterized by powder X-ray diffraction and vibrational spectroscopy. The hydrogen desorption reaction pathways were monitored by differential scanning calorimetry. The hydrogen desorption of Ca(BH$_{4}$)$_{2}$ depends strongly on the amount of coexistent α, β and γ polymorphs as well as additional ball milling and added TiF$_{3}$ to the sample. The addition of TiF3 increased the hydrogen desorption rate without significant dissociation of the fluoride. The combination of an α-Ca(BH$_{4}$)$_{2}$ rich sample with 10 mol% of TiF$_{3}$ and 8 h of milling led to up to 27 ∘C decrease of the hydrogen desorption peak temperature.

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Verlagsausgabe §
DOI: 10.5445/IR/1000125433
Veröffentlicht am 29.10.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1996-1073
KITopen-ID: 1000125433
Erschienen in Energies
Band 13
Heft 18
Seiten Art.-Nr.: 4828
Schlagwörter calcium borohydride; hydrogen storage; powder X-ray diffraction; ball milling; additives; kinetics of the hydrogen desorption; polymorphs; vibrational spectroscopy; reaction pathways; differential scanning calorimetry
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