Hydrogen storage properties of eutectic metal borohydrides melt-infiltrated into porous Al scaffolds

Sofianos, M. Veronica; Chaudhary, Anna‐Lisa; Paskevicius, Mark; Sheppard, Drew A.; Humphries, Terry D.; Dornheim, Martin; Buckley, Craig E.

doi:10.1016/j.jallcom.2018.10.086

Cited by 18 publications

(10 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We believe Utke et al rightfully highlighted in their work that both desorption (3.4 bar) and absorption (100 bar) pressure plays a substantial mechanical role over LiBH4 decomposition and affects its reversibility [119,140]. Figure 9 shows the hydrogen capacity against the temperature range for the first dehydrogenation for several nanoconfined metal/metal compound added LiBH4 and LiBH4+binary/complex hydride systems [112,113,126,127,130,132,133,141,145,150,152,153]. As seen, the onset temperature for the dehydrogenation of the nanoconfined systems is notably reduced in comparison with the observed temperature for pristine LiBH4 and the LiBH4 destabilized systems.…”

Section: Hydrogenationmentioning

confidence: 95%

Tuning LiBH4 for Hydrogen Storage: Destabilization, Additive, and Nanoconfinement Approaches

et al. 2019

View full text Add to dashboard Cite

Hydrogen technology has become essential to fulfill our mobile and stationary energy needs in a global low–carbon energy system. The non-renewability of fossil fuels and the increasing environmental problems caused by our fossil fuel–running economy have led to our efforts towards the application of hydrogen as an energy vector. However, the development of volumetric and gravimetric efficient hydrogen storage media is still to be addressed. LiBH4 is one of the most interesting media to store hydrogen as a compound due to its large gravimetric (18.5 wt.%) and volumetric (121 kgH2/m3) hydrogen densities. In this review, we focus on some of the main explored approaches to tune the thermodynamics and kinetics of LiBH4: (I) LiBH4 + MgH2 destabilized system, (II) metal and metal hydride added LiBH4, (III) destabilization of LiBH4 by rare-earth metal hydrides, and (IV) the nanoconfinement of LiBH4 and destabilized LiBH4 hydride systems. Thorough discussions about the reaction pathways, destabilizing and catalytic effects of metals and metal hydrides, novel synthesis processes of rare earth destabilizing agents, and all the essential aspects of nanoconfinement are led.

show abstract

Section: Hydrogenationmentioning

confidence: 95%

Tuning LiBH4 for Hydrogen Storage: Destabilization, Additive, and Nanoconfinement Approaches

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Metals 2019, 9, x FOR PEER REVIEW 2 of 11 hydrides or complex hydrides have been employed to improve the hydrogen storage properties of LiBH4 [14][15][16][17][18][19][20][21]. According to the theoretical calculation based on phase diagrams, the decomposition temperature of the LiBH4/Al composite was predicted to be significantly lower than that of pure LiBH4 [22,23].…”

Section: Methodsmentioning

confidence: 99%

“…The formation of MgB 2 during the dehydrogenation reaction destabilized LiBH 4 , and the reversibility of the LiBH 4 -MgH 2 composite was also better than pure LiBH 4 . After that, many metal hydrides or complex hydrides have been employed to improve the hydrogen storage properties of LiBH 4 [14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

The Dehydrogenation Mechanism and Reversibility of LiBH4 Doped by Active Al Derived from AlH3

Zhu

et al. 2019

Metals

View full text Add to dashboard Cite

A detailed analysis of the dehydrogenation mechanism and reversibility of LiBH4 doped by as-derived Al (denoted Al*) from AlH3 was performed by thermogravimetry (TG), differential scanning calorimetry (DSC), mass spectral analysis (MS), powder X-ray diffraction (XRD), scanning electronic microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR). The results show that the dehydrogenation of LiBH4/Al* is a five-step reaction: (1) LiBH4 + Al → LiH + AlB2 + “Li-Al-B-H” + B2H6 + H2; (2) the decomposition of “Li-Al-B-H” compounds liberating H2; (3) 2LiBH4 + Al → 2LiH + AlB2 + 3H2; (4) LiBH4 → LiH + B + 3/2H2; and (5) LiH + Al → LiAl + 1/2H2. Furthermore, the reversibility of the LiBH4/Al* composite is based on the following reaction: LiH + LiAl + AlB2 + 7/2H2 ↔ 2LiBH4 + 2Al. The extent of the dehydrogenation reaction between LiBH4 and Al* greatly depends on the precipitation and growth of reaction products (LiH, AlB2, and LiAl) on the surface of Al*. A passivation shell formed by these products on the Al* is the kinetic barrier to the dehydrogenation of the LiBH4/Al* composite.

show abstract

“…However, despite their great hydrogen content, alkali and alkali earth borohydrides are generally characterized by high stability and slow kinetics of reaction, reflected in high decomposition C 2020, 6, 19; doi:10.3390/c6020019 www.mdpi.com/journal/carbon temperatures and poor cyclability [16][17][18][19]. The dehydrogenation temperature of borohydrides can be reduced through different routes; cation substitution and phase transformation but also increase of the hydride surface area through, e.g., the contact with an external surface, are some of the most widely studied approaches [20][21][22][23][24]. The combined effect of cation substitution and phase (from solid to liquid) transition on the dehydrogenation temperature is particularly evident on borohydride eutectic mixtures, such as that of LiBH 4 and KBH 4 , which are the subject of this work.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Sorption and Reversibility of the LiBH4-KBH4 Eutectic System Confined in a CMK-3 Type Carbon via Melt Infiltration

Peru

Payandeh

Charalambopoulou

et al. 2020

View full text Add to dashboard Cite

Metal borohydrides have very high hydrogen densities but their poor thermodynamic and kinetic properties hinder their use as solid hydrogen stores. An interesting approach to improve their functionality is nano-sizing by confinement in mesoporous materials. In this respect, we used the 0.725 LiBH4–0.275 KBH4 eutectic mixture, and by exploiting its very low melting temperature (378 K) it was possible to successfully melt infiltrate the borohydrides in a mesoporous CMK-3 type carbon (pore diameter ~5 nm). The obtained carbon–borohydride composite appears to partially alleviate the irreversibility of the dehydrogenation reaction when compared with the bulk LiBH4-KBH4, and shows a constant hydrogen uptake of 2.5 wt%–3 wt% for at least five absorption–desorption cycles. Moreover, pore infiltration resulted in a drastic decrease of the decomposition temperature (more than 100 K) compared to the bulk eutectic mixture. The increased reversibility and the improved kinetics may be a combined result of several phenomena such as the catalytic action of the carbon surface, the nano-sizing of the borohydride particles or the reduction of irreversible side-reactions.

show abstract

Hydrogen storage properties of eutectic metal borohydrides melt-infiltrated into porous Al scaffolds

Cited by 18 publications

References 62 publications

Tuning LiBH4 for Hydrogen Storage: Destabilization, Additive, and Nanoconfinement Approaches

Tuning LiBH4 for Hydrogen Storage: Destabilization, Additive, and Nanoconfinement Approaches

The Dehydrogenation Mechanism and Reversibility of LiBH4 Doped by Active Al Derived from AlH3

Hydrogen Sorption and Reversibility of the LiBH4-KBH4 Eutectic System Confined in a CMK-3 Type Carbon via Melt Infiltration

Contact Info

Product

Resources

About