Effects of Ball Milling and TiF 3 Addition on the Dehydrogenation Temperature of Ca(BH 4 ) 2 Polymorphs

Isabel Llamas Jansa, Oliver Friedrichs, Maximilian Fichtner, Elisa Gil Bardají, Andreas Züttel and Bjørn C. Hauback
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Isabel Llamas Jansa: Institute for Energy Technology, Box 40, 2027 Kjeller, Norway
Oliver Friedrichs: Empa Mat. Sci. & Technol., Uberlandstr. 129, CH-8600 Dubendorf, Switzerland
Maximilian Fichtner: Helmholtz Institute Ulm, Helmholtzstraβe 11, 89081 Ulm, Germany
Elisa Gil Bardají: Karlsruhe Institute of Technology, POB 3640, D-76021 Karlsruhe, Germany
Andreas Züttel: École Polytechnique Fédérale de Lausanne Valais/Wallis, Laboratory of Materials for Renewable Energy, Institute of Chemical Sciences and Engineering and Basic Science Faculty, Energypolis, Rue de l’Industrie 17, CH-1950 Sion, Switzerland
Bjørn C. Hauback: Institute for Energy Technology, Box 40, 2027 Kjeller, Norway

Energies, 2020, vol. 13, issue 18, 1-12

Abstract: 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 TiF 3 , 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 TiF 3 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.

Keywords: calcium borohydride; hydrogen storage; powder X-ray diffraction; ball milling; additives; kinetics of the hydrogen desorption; polymorphs; vibrational spectroscopy; reaction pathways; differential scanning calorimetry (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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