NbF5 additive improves hydrogen release from magnesium borohydride

Al-Kukhun, Ahmad; Hwang, Hyun Tae; Varma, Arvind

doi:10.1016/j.ijhydene.2012.09.097

Cited by 55 publications

(21 citation statements)

References 28 publications

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“…In this work, no changes in hydrogen release kinetics from MBH at 300ºC were observed after addition of SiO 2 . This fact confirmed our SEM observation that a better contact between MBH and SiO 2 was found in the prepared composite, which was not obtained with the simple mixing employed by Al-Kukhun et al [17], therefore the used aerogel might be considered as nanoscaffold for MBH Alternatively, it could be also due to some different properties of the silica used in this work and in the work of Al-Kukhun et al [17], such as acidity, which could be responsible of the weakening of B-H bond and the kinetic improvement during dehydrogenation [18].…”

Section: Hydrogen Desorption At 300ºc and 400ºcsupporting

confidence: 91%

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Reversible hydrogen sorption in the composite made of magnesium borohydride and silica aerogel

Rueda

Sanz-Moral

Girella³

et al. 2016

International Journal of Hydrogen Energy

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Magnesium borohydride Mg(BH 4 ) 2 is a promising hydrogen storage material as it releases high hydrogen storage capacity at mild desorption temperatures, but it is still limited by slow hydrogen release kinetics and by the harsh conditions required to re-hydrogenate this compound. In this work, composites made of commercial Mg(BH 4 ) 2 and synthesized silica aerogel microparticles were prepared by thermal treatment in hydrogen under 120 bar and 200ºC. As a result, the sorption properties of the hydride are improved: calorimetric measurements show that decomposition temperature is reduced by 60ºC, and the typical 3-step decomposition mechanism of Mg(BH 4 ) 2 changes to a single-step mechanism in range of 220-400°C. The kinetics of the first dehydrogenation at 300ºC was two times faster in Mg(BH 4 ) 2 -SiO 2 composites than in the case of bulk γ-Mg(BH 4 ) 2 . Additionally, the re-hydrogenation of this material at comparatively moderate conditions of 390ºC and 110 bar is presented for the first time, achieving cyclability with a reversible release of hydrogen up to 6wt%. Different amounts of hydrogen were exchanged depending on the temperature of desorption (300ºC or 400ºC) and the presence or absence of silica aerogel. This result indicates that silica aerogel chemically interacts with Mg(BH 4 ) 2 , acting as an additive, which can result in different hydrogenationdehydrogenation routes in which different amounts and types of intermediates are formed, influencing the kinetics and the cyclability.

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Section: Hydrogen Desorption At 300ºc and 400ºcsupporting

confidence: 91%

“…Hydrogen release kinetics at 300°C was improved in the sample in which silica was present. Different results were obtained respect to the work of Al-Kukhun et al [17]. In this work, no changes in hydrogen release kinetics from MBH at 300ºC were observed after addition of SiO 2 .…”

Section: Hydrogen Desorption At 300ºc and 400ºccontrasting

confidence: 81%

Reversible hydrogen sorption in the composite made of magnesium borohydride and silica aerogel

Rueda

Sanz-Moral

Girella³

et al. 2016

International Journal of Hydrogen Energy

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“…Small quantities ($2 mol%) of TM additives, such as NbCl 5 , NbF 5 , TiCl 3 , TiO 2 , Ti-Nb, TiF 3 , ScCl 3 , CoCl 2 , ZnF 2 , have been shown to signicantly reduce the temperature of hydrogen release of various polymorphs and composites of Mg(BH 4 ) 2 during the rst decomposition. 11,16,17,23,24,30,31 Only few of these studies have explored the effect of the additives on the rehydrogenation. Bardaji et al 23 did not observe rehydrogenation of Mg(BH 4 ) 2 decomposed above 450 C in the presence of Ti-and Nb-based additives.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen cycling in γ-Mg(BH₄)₂ with cobalt-based additives

et al. 2015

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“…Consequently, the dehydrogenation temperature is reduced to 360 • C. However, the hydrogen capacity of the system is still low, i.e., 4.5 wt %. The effect of additives on the reversibility of Mg(BH 4 ) 2 has been an object of intensive investigation [101,[183][184][185][186][187][188]. The result of the doping seems to be a sensible acceleration of hydrogenation and dehydrogenation processes.…”

Section: Nabhmentioning

confidence: 99%

Tetrahydroborates: Development and Potential as Hydrogen Storage Medium

et al. 2017

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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.

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NbF5 additive improves hydrogen release from magnesium borohydride

Cited by 55 publications

References 28 publications

Reversible hydrogen sorption in the composite made of magnesium borohydride and silica aerogel

Reversible hydrogen sorption in the composite made of magnesium borohydride and silica aerogel

Hydrogen cycling in γ-Mg(BH₄)₂ with cobalt-based additives

Tetrahydroborates: Development and Potential as Hydrogen Storage Medium

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NbF5 additive improves hydrogen release from magnesium borohydride

Cited by 55 publications

References 28 publications

Reversible hydrogen sorption in the composite made of magnesium borohydride and silica aerogel

Reversible hydrogen sorption in the composite made of magnesium borohydride and silica aerogel

Hydrogen cycling in γ-Mg(BH4)2 with cobalt-based additives

Tetrahydroborates: Development and Potential as Hydrogen Storage Medium

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Product

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Hydrogen cycling in γ-Mg(BH₄)₂ with cobalt-based additives