Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 183, Issue 5, Pages 1133-1140Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2010.03.026
Keywords
Calcium dodedecahydro-closo-dodecaborate; Hydrogen storage; Metal borohydrides; X-ray and neutron techniques; Density functional theory
Funding
- US Department of Energy, Office of Energy Efficiency and Renewable Energy [DE-AC04-94AL85000, DE-AI-01-05EE11104, DE-AI-01-05EE11105]
- National Science Foundation (NSF) [9724240]
- NSF [DMR-0520565]
- National Research Foundation of Korea [핵06B3014] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Calcium borohydride can reversibly store up to 9.6 wt% hydrogen; however, the material displays poor cyclability, generally associated with the formation of stable intermediate species. In an effort to understand the role of such intermediates on the hydrogen storage properties of Ca(BH4)(2), calcium dodecahydro-closo-dodecaborate was isolated and characterized by diffraction and spectroscopic techniques. The crystal structure of CaB12H12 was determined from powder XRD data and confirmed by DFT and neutron vibrational spectroscopy studies. Attempts to dehydrogenate/hydrogenate mixtures of CaB12H12 and CaH2 were made under conditions known to favor partial reversibility in calcium borohydride. However, up to 670 K no notable formation of Ca(BH4)(2) (during hydrogenation) or CaB6 (during dehydrogenation) occurred. It was demonstrated that the stability of CaB12H12 can be significantly altered using CaH2 as a destabilizing agent to favor the hydrogen release. Published by Elsevier Inc.
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