Article pubs.acs.org/JPCC
The Role of Ca(BH4)2 Polymorphs Isabel Llamas-Jansa,*,† Oliver Friedrichs,‡ Maximilian Fichtner,§ Elisa Gil Bardaji,§ Andreas Züttel,‡ and Bjørn C. Hauback† †
Physics Department, Institute for Energy Technology, P.O. Box 40, NO-2027, Kjeller, Norway Division of Hydrogen & Energy, Department of Mobil Environment & Energy, Empa Materials Science & Technology, Uberlandstrasse 129, CH-8600 Dubendorf, Switzerland § Institute of Nanotechnology, Karlsruhe Institute of Technology, POB 3640, D-76021 Karlsruhe, Germany ‡
ABSTRACT: This study compares the structure and decomposition behaviors of the α, β, and γ polymorphs of Ca(BH4)2 for hydrogen storage. Samples with different polymorphic contents are characterized using powder X-ray diffraction and vibrational spectroscopy. Decomposition paths and formation of decomposition products are monitored by differential scanning calorimetry and temperature programed desorption as well as in situ synchrotron radiation powder diffraction. Vibrational spectroscopy in the
