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A NaAlH 4 -Ca(BH 4 ) 2 composite system for hydrogen storage

DOI: 10.1016/j.jallcom.2017.05.264 DOI Help

Authors: Kasper T. Moller (University of Aarhus) , Jakob B. Grinderslev (University of Aarhus) , Torben R. Jensen (University of Aarhus)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Alloys And Compounds

State: Published (Approved)
Published: May 2017
Diamond Proposal Number(s): 12714

Abstract: Mechanochemical treatment (ball-milling) of NaAlH4-Ca(BH4)2 mixtures leads to partial formation of NaBH4 and Ca(AlH4)2 by a metathesis reaction. The reaction proceeds to different extents depending on the applied ball-milling times, which is confirmed by powder X-ray diffraction and infrared spectroscopy. Additionally, an in-situ synchrotron radiation powder X-ray diffraction study reveals that the metathesis reaction continues due to thermal treatment while the data also supports a two-step decomposition of the formed Ca(AlH4)2. Finally, the reactive hydride composite system was investigated by mass spectrometry and Sieverts' measurement, which reveal release of ∼6 wt% H2 at T < 375 °C.

Journal Keywords: Hydrogen storage; Reactive hydride composites; Sodium alanate; Calcium alanate

Subject Areas: Chemistry

Instruments: I11-High Resolution Powder Diffraction