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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Isabel Llamas Jansa & Oliver Friedrichs & Maximilian Fichtner & Elisa Gil Bardají & Andreas Züttel & Bjørn C. Hauback, 2020. "Effects of Ball Milling and TiF 3 Addition on the Dehydrogenation Temperature of Ca(BH 4 ) 2 Polymorphs," Energies, MDPI, vol. 13(18), pages 1-12, September.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:18:p:4828-:d:414013
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