Destabilization of LiAlH4 by nanocrystalline MgH2 |
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| Authors: | Andrew W Vittetoe Michael U Niemann Sesha S Srinivasan Kimberly McGrath Ashok Kumar D Yogi Goswami Elias K Stefanakos Sylvia Thomas |
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| Affiliation: | 1. Clean Energy Research Center, University of South Florida, Tampa, FL 33620, USA;2. College of Engineering, University of South Florida, Tampa, FL 33620, USA;3. QuantumSphere Inc., 2905 Tech Center Drive, Santa Ana, CA 92705, USA |
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| Abstract: | In this work, we report the synthesis, characterization and destabilization of lithium aluminum hydride by ad-mixing nanocrystalline magnesium hydride (e.g. LiAlH4 + nanoMgH2). A new nanoparticulate complex hydride mixture (Li–nMg–Al–H) was obtained by solid-state mechano-chemical milling of the parent compounds at ambient temperature. Nanosized MgH2 is shown to have greater and improved hydrogen performance in terms of storage capacity, kinetics, and initial temperature of decomposition, over the commercial MgH2. The pressure–composition isotherms (PCI) reveal that the destabilized LiAlH4 + nanoMgH2 possess ∼5.0 wt.% H2 reversible capacity at T ≤ 350 °C. Van't Hoff calculations demonstrate that the destabilized (LiAlH4 + nanoMgH2) complex materials have comparable enthalpy of hydrogen release (∼85 kJ/mole H2) to their pristine counterparts, LiAlH4 and MgH2. However, these new destabilized complex hydrides exhibit reversible hydrogen sorption behavior with fast kinetics. |
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| Keywords: | LiAlH4 Hydrogen storage Mechano-chemical synthesis Complex hydrides Dehydrogenation Nanocrystalline |
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