Sorption properties of NaBH4/MH2 (M=Mg, Ti) powder systems

Garroni, Sebastiano; Milanese, Chiara; Girella, Alessandro; Marini, Amedeo; Mulas, G.; Menéndez, Enric; Pistidda, Claudio; Dornheim, Martin; Suriñach, Santiago; Baró, Maria Dolores

doi:10.1016/j.ijhydene.2010.03.004

Cited by 58 publications

(61 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, despite recent progress, the employment of scaffolds drastically decreases the hydrogen storage density of the whole system. The third approach concerns with the opportunity to tailor the thermodynamic properties of complex hydrides by incorporating a second or a third compound in the reacting mixture to stabilize the reaction products [18][19][20][21][22][23] [27]. Nevertheless, despite the long list of works on the LiBH 4 /LiAlH 4 system, up to our knowledge, no experimental investigation is reported for the nominal stoichiometry 1:1.…”

Section: Introductionmentioning

confidence: 99%

Structural evolution upon decomposition of the LiAlH4+LiBH4 system

Soru

Taras

Pistidda

et al. 2014

Journal of Alloys and Compounds

Self Cite

View full text Add to dashboard Cite

a b s t r a c tIn the present work we focus the attention on the phase structural transformations occurring upon the desorption process of the LiBH 4 + LiAlH 4 system. This study is conducted by means of manometriccalorimetric, in situ Synchrotron Radiation Powder X-ray Diffraction (SR-PXD) and ex situ Solid State Magic Angle Spinning (MAS) Nuclear Magnetic Resonance (NMR) measurements. The desorption reaction is characterized by two main dehydrogenation steps starting at 320 and 380°C, respectively. The first step corresponds to the decomposition of LiAlH 4 into Al and H 2 via the formation of Li 3 AlH 6 whereas the second one refers to the dehydrogenation of LiBH 4 (molten state). In the range 328-380°C, the molten LiBH 4 reacts with metallic Al releasing hydrogen and forming an unidentified phase which appears to be an important intermediate for the desorption mechanism of LiBH 4 -Al-based systems. Interestingly, NMR studies indicate that the unknown intermediate is stable up to 400°C and it is mainly composed of Li, B, Al and H. In addition, the NMR measurements of the annealed powders (400°C) confirm that the desorption reaction of the LiBH 4 + Al system proceeds via an amorphous boron compound.

show abstract

Section: Introductionmentioning

confidence: 99%

Structural evolution upon decomposition of the LiAlH4+LiBH4 system

Soru

Taras

Pistidda

et al. 2014

Journal of Alloys and Compounds

Self Cite

View full text Add to dashboard Cite

show abstract

“…The dehydrogenation reactions of the 2NaBH 4 + MgH 2 can proceed either as reaction (55) (56) However, the dehydrogenation of this system also goes on in two steps under 1 bar of inert gas, i.e., first the dehydrogenation of MgH 2 and then the subsequent formation of MgB 2 [178,180]. Furthermore, the formation of stable side products such as Na 2 B 12 H 12 has been also suggested [180]. Under vacuum, the pathway is different and it involves the formation of free Mg and finally free B [181].…”

Section: Nabhmentioning

confidence: 99%

Tetrahydroborates: Development and Potential as Hydrogen Storage Medium

et al. 2017

View full text Add to dashboard Cite

Abstract:The use of fossil fuels as an energy supply becomes increasingly problematic from the point of view of both environmental emissions and energy sustainability. As an alternative, hydrogen is widely regarded as a key element for a potential energy solution. However, differently from fossil fuels such as oil, gas, and coal, the production of hydrogen requires energy. Alternative and intermittent renewable energy sources such as solar power, wind power, etc., present multiple advantages for the production of hydrogen. On the one hand, the renewable sources contribute to a remarkable reduction of pollutants released to the air and on the other hand, they significantly enhance the sustainability of energy supply. In addition, the storage of energy in form of hydrogen has a huge potential to balance an effective and synergetic utilization of renewable energy sources. In this regard, hydrogen storage technology is a key technology towards the practical application of hydrogen as "energy carrier". Among the methods available to store hydrogen, solid-state storage is the most attractive alternative from both the safety and the volumetric energy density points of view. Because of their appealing hydrogen content, complex hydrides and complex hydride-based systems have attracted considerable attention as potential energy vectors for mobile and stationary applications. In this review, the progresses made over the last century on the synthesis and development of tetrahydroborates and tetrahydroborate-based systems for hydrogen storage purposes are summarized.

show abstract

“…Recently, many efforts have been devoted to decrease the hydrogen desorption temperature of NaBH 4 . Several opportunities of tuning the thermodynamic and kinetic properties were re-ported as, for example, combining it with a second hydride phase [3e7] or confining it in a nanoporous carbon or SBA-15 matrix [8,9].…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical synthesis of NaBH4 starting from NaH–MgB2 reactive hydride composite system

Garroni

Minella

Pottmaier

et al. 2013

International Journal of Hydrogen Energy

Self Cite

View full text Add to dashboard Cite

The present investigation focuses on a new synthesis route of NaBH 4 starting from the 2NaH þ MgB 2 system subjected to mechanochemical activation under reactive hydrogen atmosphere. The milling process was carried out under two different hydrogen pressures (1 and 120 bar) with two different rotation speeds (300 and 550 rpm). The reaction products were characterized by ex-situ solid state magic angle spinning (MAS) nuclear magnetic resonance (NMR), ex-situ X-ray powder diffraction (XRPD) and Infrared Spectroscopy (IR). From the results of these analyses, it can be concluded that milling in all the considered conditions led to the formation of NaBH 4 (cubic-Fm-3m). In particular, a reaction yield of 5 and 14 wt% is obtained after 20 h of milling at 120 bar of H 2 for the tests performed at 300 rpm and 550 rpm, respectively. The presence of MgH 2 is also detected among the final products on the as milled powders. The influence of the milling conditions and the eval-uation of the parameters related the mechanochemical process are here discussed.1.

show abstract

Sorption properties of NaBH4/MH2 (M=Mg, Ti) powder systems

Cited by 58 publications

References 32 publications

Structural evolution upon decomposition of the LiAlH4+LiBH4 system

Structural evolution upon decomposition of the LiAlH4+LiBH4 system

Tetrahydroborates: Development and Potential as Hydrogen Storage Medium

Mechanochemical synthesis of NaBH4 starting from NaH–MgB2 reactive hydride composite system

Contact Info

Product

Resources

About