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Crystals 2016, 6(6), 70;

Hydrogen Desorption Properties of Bulk and Nanoconfined LiBH4-NaAlH4

Center for Energy Materials, Interdisciplinary Nanoscience Center (iNANO), and Department of Chemistry, Aarhus University, DK-8000 Aarhus, Denmark
Department of Imaging and Applied Physics, Curtin University, GPO Box U 1987, Perth, WA 6845, Australia
Author to whom correspondence should be addressed.
Academic Editors: Umit B. Demirci, Philippe Miele and Pascal G. Yot
Received: 10 April 2016 / Revised: 8 June 2016 / Accepted: 9 June 2016 / Published: 20 June 2016
(This article belongs to the Special Issue Boron-Based (Nano-)Materials: Fundamentals and Applications)
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Nanoconfinement of 2LiBH4-NaAlH4 into a mesoporous carbon aerogel scaffold with a pore size, BET surface area and total pore volume of Dmax = 30 nm, SBET = 689 m2/g and Vtot = 1.21 mL/g, respectively is investigated. Nanoconfinement of 2LiBH4-NaAlH4 facilitates a reduction in the temperature of the hydrogen release by 132 °C, compared to that of bulk 2LiBH4-NaAlH4 and the onset of hydrogen release is below 100 °C. The reversible hydrogen storage capacity is also significantly improved for the nanoconfined sample, maintaining 83% of the initial hydrogen content after three cycles compared to 47% for that of the bulk sample. During nanoconfinement, LiBH4 and NaAlH4 reacts to form LiAlH4 and NaBH4 and the final dehydrogenation products, obtained at 481 °C are LiH, LiAl, AlB2 and Al. After rehydrogenation of the nanoconfined sample at T = 400 °C and p(H2) = 126 bar, amorphous NaBH4 is recovered along with unreacted LiH, AlB2 and Al and suggests that NaBH4 is the main compound that can reversibly release and uptake hydrogen. View Full-Text
Keywords: nanoconfinement; metal borohydride; sodium alanate nanoconfinement; metal borohydride; sodium alanate

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Javadian, P.; Sheppard, D.A.; Buckley, C.E.; Jensen, T.R. Hydrogen Desorption Properties of Bulk and Nanoconfined LiBH4-NaAlH4. Crystals 2016, 6, 70.

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