Hydrogen sorption and reaction mechanisms of nanoconfined 2LiBH4–NaAlH4

Thiangviriya, Sophida; Plerdsranoy, Praphatsorn; Wiset, Nuntida; Javadian, Payam; Utke, Rapee

doi:10.1016/j.jallcom.2015.02.030

Cited by 23 publications

(13 citation statements)

References 26 publications

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“…7, 11 B MAS NMR spectrum of bulk LiBH 4 and milled LiBH 4 eLiAlH 4 show a typical resonance of BH 4 À group centered at À41.7 ppm, approaching to the previous studies [19,32,46]. For as-prepared powder sample of nano LiBH 4 eLiAlH 4 eACNF, the resonance of LiBH 4 splits into two peaks, i.e., sharp and broad peaks at À38.2 and À42.7 ppm, respectively (Fig.…”

Section: Resultssupporting

confidence: 50%

“…LiBH 4 nanoconfined into several hosts, such as carbon aerogel scaffold [21e23], poly(methyl methacrylate) [24,25], activated carbon nanofiber [26], via both direct melt infiltration and solution impregnation have been proposed. Moreover, various RHCs of LiBH 4 with other hydrides nanoconfined into carbon aerogel scaffold (e.g., LiBH 4 eMgH 2 [27e31], LiBH 4 eNaAlH 4 [32], LiBH 4 eMg(BH 4 ) 2 [33,34], and 2LiBH 4 eLiAlH 4 [35]) have been remarkably of interest. Nanoconfinement of both LiBH 4 and its RHCs provided significant improvement in dehydrogenation kinetics, suppression of toxic diborane (B 2 H 6 ) gas release, and mild temperature and pressure conditions for rehydrogenation as compared with bulk materials.…”

Section: Introductionmentioning

confidence: 99%

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Confined LiBH4–LiAlH4 in nanopores of activated carbon nanofibers

Plerdsranoy

Utke

2015

International Journal of Hydrogen Energy

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Section: Resultssupporting

confidence: 50%

Section: Introductionmentioning

confidence: 99%

Confined LiBH4–LiAlH4 in nanopores of activated carbon nanofibers

Plerdsranoy

Utke

2015

International Journal of Hydrogen Energy

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“…The binary hydride composite 2LiBH 4 -NaAlH 4 (LiNa) has been successfully melt infiltrated into the mesoporous carbon scaffold via melt infiltration upon elevated hydrogen pressures of p(H 2 ) = 110 bar, in order to avoid decomposition of the respective hydrides (please see note about this in experimental section). Confinement of the hydride mixture facilitates the formation of nanoparticles of the respective hydrides, in accordance with previous studies [27]. The amount of 2LiBH 4 -NaAlH 4 added to CA is 25.3 wt.…”

Section: Nanoporous Carbon Aerogel Compositesupporting

confidence: 89%

“…Commercially available NaAlH 4 (Aldrich, 93%) was physically mixed with LiBH 4 (Aldrich, ě95.0%) in the molar ratio 2LiBH 4 -NaAlH 4 which was recently reported to show suitable melt infiltration abilities [27]. This sample is denoted LiNa.…”

Section: Sample Preparationmentioning

confidence: 99%

Hydrogen Desorption Properties of Bulk and Nanoconfined LiBH4-NaAlH4

2016

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Nanoconfinement of 2LiBH 4 -NaAlH 4 into a mesoporous carbon aerogel scaffold with a pore size, BET surface area and total pore volume of D max = 30 nm, S BET = 689 m 2 /g and V tot = 1.21 mL/g, respectively is investigated. Nanoconfinement of 2LiBH 4 -NaAlH 4 facilitates a reduction in the temperature of the hydrogen release by 132˝C, compared to that of bulk 2LiBH 4 -NaAlH 4 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, LiBH 4 and NaAlH 4 reacts to form LiAlH 4 and NaBH 4 and the final dehydrogenation products, obtained at 481˝C are LiH, LiAl, AlB 2 and Al. After rehydrogenation of the nanoconfined sample at T = 400˝C and p(H 2 ) = 126 bar, amorphous NaBH 4 is recovered along with unreacted LiH, AlB 2 and Al and suggests that NaBH 4 is the main compound that can reversibly release and uptake hydrogen.

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“…A few studies have been conducted on attempting to enhance the kinetics and reduce the temperature for hydrogen desorption of similar complex binary eutectic borohydride systems, by introducing carbon scaffolds. Several systems explore the properties of binary complex hydrides for nanoconfinement such as LiBH 4 eCa(BH 4 )2 [8,21e23], LiBH 4 eMg 2 NiH 4 [24], LiBH 4 eMg(BH 4 ) 2 [11e13,25], LiBH 4 eLiAlH 4 [26] and LiBH 4 eNaAlH 4 [27]. These systems all form eutectic melts when mixed together which makes them suitable for infiltration into porous scaffolds.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen storage properties of nanoconfined LiBH 4 –NaBH 4

Javadian

Sheppard

Buckley

2015

International Journal of Hydrogen Energy

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Eutectic melting compositeCarbon dioxide activation Cyclic stability a b s t r a c tIn this study a eutectic melting composite of 0.62LiBH 4 e0.38NaBH 4 has been infiltrated in two nanoporous resorcinol formaldehyde carbon aerogel scaffolds with similar pore sizes (37 and 38 nm) but different BET surface areas (690 and 2358 m 2 /g) and pore volumes (1.03 and 2.64 mL/g). This investigation clearly shows decreased temperature of hydrogen desorption, and improved cycling stability during hydrogen release and uptake of bulk 0.62LiBH 4 e0.38NaBH 4 when nanoconfined into carbon nanopores. The hydrogen desorption temperature of bulk 0.62LiBH 4 e0.38NaBH 4 is reduced by~107 C with the presence of carbon, although a minor kinetic variation is observed between the two carbon scaffolds.This corresponds to apparent activation energies, E A , of 139 kJ mol À1 (bulk) and 116 e118 kJ mol À1 (with carbon aerogel). Bulk 0.62LiBH 4 e0.38NaBH 4 has poor reversibility during continuous hydrogen release and uptake cycling, maintaining 22% H 2 capacity after four hydrogen desorptions (1.6 wt.% H 2 ). In contrast, nanoconfinement into the high surface area carbon aerogel scaffold significantly stabilizes the hydrogen storage capacity, maintaining~70% of the initial capacity after four cycles (4.3 wt.% H 2 ).

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Hydrogen sorption and reaction mechanisms of nanoconfined 2LiBH4–NaAlH4

Cited by 23 publications

References 26 publications

Confined LiBH4–LiAlH4 in nanopores of activated carbon nanofibers

Confined LiBH4–LiAlH4 in nanopores of activated carbon nanofibers

Hydrogen Desorption Properties of Bulk and Nanoconfined LiBH4-NaAlH4

Hydrogen storage properties of nanoconfined LiBH 4 –NaBH 4

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