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Crystals 2016, 6(6), 70; doi:10.3390/cryst6060070

Hydrogen Desorption Properties of Bulk and Nanoconfined LiBH4-NaAlH4

1
Center for Energy Materials, Interdisciplinary Nanoscience Center (iNANO), and Department of Chemistry, Aarhus University, DK-8000 Aarhus, Denmark
2
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)
View Full-Text   |   Download PDF [12231 KB, uploaded 20 June 2016]   |  

Abstract

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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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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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