A comparative study of LiBH4-based composites with metal hydrides and fluorides for hydrogen storage

Yuan, Pei Pei; Liu, Bin Hong; Li, Zhou Peng

doi:10.1016/j.ijhydene.2011.09.001

Cited by 10 publications

(3 citation statements)

References 25 publications

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“…This emphasizes the importance of the Ca(BH 4 ) 2 decomposition product to promote full hydrogen absorption and desorption of LiBH 4 . The full reversibility of LiBH 4 in the bulk and nanoconfined state has not been reported so far in the literature. ,− Other attempts to rehydrogenate LiBH 4 at temperatures of 500 °C and higher have been made but with no success in obtaining full reversibility …”

Section: Resultsmentioning

confidence: 99%

Reversibility of LiBH₄ Facilitated by the LiBH₄–Ca(BH₄)₂ Eutectic

Javadian

Payandeh

et al. 2017

J. Phys. Chem. C

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The hydrogen storage properties of eutectic melting 0.68LiBH4–0.32Ca(BH4)2 (LiCa) as bulk and nanoconfined into a high surface area, S BET = 2421 ± 189 m2/g, carbon aerogel scaffold, with an average pore size of 13 nm and pore volume of V tot = 2.46 ± 0.46 mL/g, is investigated. Hydrogen desorption and absorption data were collected in the temperature range of RT to 500 °C (ΔT/Δt = 5 °C/min) with the temperature then kept constant at 500 °C for 10 h at hydrogen pressures in the range of 1–8 and 134–144 bar, respectively. The difference in the maximum H2 release rate temperature, T max, between bulk and nanoconfined LiCa during the second cycle is ΔT max ≈ 40 °C, which over five cycles becomes smaller, ΔT max ≈ 10 °C. The high temperature, T max ≈ 455 °C, explains the need for high temperatures for rehydrogenation in order to obtain sufficiently fast reaction kinetics. This work also reveals that nanoconfinement has little effect on the later cycles and that nanoconfinement of pure LiBH4 has a strong effect in only the first cycle of H2 release. The hydrogen storage capacity is stable for bulk and nanoconfined LiCa in the second to the fifth cycle, which contrasts to nanoconfined LiBH4 where the H2 storage capacity continuously decreases. Bulk and nanoconfined LiCa have hydrogen storage capacities of 5.4 and 3.7 wt % H2 in the fifth H2 release, which compare well with the calculated hydrogen contents of LiBH4 only and in LiCa, which are 5.43 and 3.69 wt % H2, respectively. Thus, decomposition products of Ca(BH4)2 appear to facilitate the full reversibility of the LiBH4, and this approach may lead to new hydrogen storage systems with stable energy storage capacity over multiple cycles of hydrogen release and uptake.

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Section: Resultsmentioning

confidence: 99%

Reversibility of LiBH₄ Facilitated by the LiBH₄–Ca(BH₄)₂ Eutectic

Javadian

Payandeh

et al. 2017

J. Phys. Chem. C

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“…It was explained by the formation of MgF 2 and LiBH 4Ày F y during hydrogenation process, where on the one hand formation of MgF 2 (more stable than MgH 2 ) is the driving force for hydrogen absorption and on the other hand LiBH 4Ày F y (less stable than LiBH 4 ) improves hydrogen desorption. In the next paper [9] it was suggested that LiBH 4 and MgF 2 may exchange H À and F À during heating, resulting in the formation of MgH 2 , since MgF 2 is thermodynamically very stable.…”

Section: Introductionmentioning

confidence: 99%

NEXAFS study of 2LiF–MgB2 composite

Saldan¹,

Ramallo‐López²,

Requejo³

et al. 2012

International Journal of Hydrogen Energy

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“…Many attempts to tailor the temperature required for dehydrogenation and to improve the cycling stability of borohydrides have been made, such as adding additives/catalysts [9,19,[43][44][45][46][47], forming reactive hydride composites [48][49][50][51][52][53][54][55] and confining into nano-porous scaffolds [56][57][58][59]. Furthermore, adding Ni to LiBH4 forms an interesting LiBH4-Ni system, which has received attention due to the low dehydrogenation enthalpy values (18-34 kJ mol -1 H2) of the possible chemical reactions (Equation 1-3), generating nickel borides (i.e.…”

Section: Introductionmentioning

confidence: 99%