Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 509, Issue -, Pages S714-S718Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.11.045
Keywords
Hydrogen storage; Borohydrides; Ball-milling; Hydrogen absorption; Sorption kinetics
Ask authors/readers for more resources
Among the borohydrides proposed for solid state hydrogen storage, Ca(BH4)(2) is particularly interesting because of its favourable thermodynamics and relatively cheap price. Composite systems, where other species are present in addition to the borohydride, show some advantages in hydrogen sorption properties with respect to the borohydrides alone, despite a reduction of the theoretical storage capacity. We have investigated the milling time influence on the sorption properties of the CaH2 + MgB2 system from which Ca(BH4)(2) and MgH2 can be synthesized by hydrogen absorption process. Manometric and calorimetric measurements showed better kinetics for long time milled samples. We found that the total substitution of MgB2 with AlB2 in the starting material can improve the sorption properties significantly, while the co-existence of both magnesium and aluminum borides in the starting mixture did not cause any improvement. Rietveld refinements of the X-ray powder diffraction spectra were used to confirm the hypothesized reactions. (C) 2010 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available