Dehydrogenation properties of two phases of LiNH2BH3

Liu, Xiaoran; Wang, Shumao; Wu, Yuanfang; Li, Zhinian; Jiang, Lijun; Guo, Xiping; Ye, Jianhua

doi:10.1016/j.ijhydene.2019.11.105

Cited by 8 publications

(6 citation statements)

References 34 publications

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“…Lithium amidoborane has a high gravimetric hydrogen density, with 13.7 wt% H 2 , and this makes it attractive in the field. Under heating, it dehydrogenates according to a nearly thermally neutral event (−3 kJ mol −1 ), and at temperatures below 100 • C [306]. The purity of the released hydrogen is not clear.…”

Section: Alkali and Alkaline-earth Derivatives Of Ammonia Boranementioning

confidence: 99%

Ammonia Borane: An Extensively Studied, Though Not Yet Implemented, Hydrogen Carrier

Demirci

2020

Energies

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Ammonia borane H3N−BH3 (AB) was re-discovered, in the 2000s, to play an important role in the developing hydrogen economy, but it has seemingly failed; at best it has lagged behind. The present review aims at analyzing, in the context of more than 300 articles, the reasons why AB gives a sense that it has failed as an anodic fuel, a liquid-state hydrogen carrier and a solid hydrogen carrier. The key issues AB faces and the key challenges ahead it has to address (i.e., those hindering its technological deployment) have been identified and itemized. The reality is that preventable errors have been made. First, some critical issues have been underestimated and thereby understudied, whereas others have been disproportionally considered. Second, the potential of AB has been overestimated, and there has been an undoubted lack of realistic and practical vision of it. Third, the competition in the field is severe, with more promising and cheaper hydrides in front of AB. Fourth, AB has been confined to lab benches, and consequently its technological readiness level has remained low. This is discussed in detail herein.

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Section: Alkali and Alkaline-earth Derivatives Of Ammonia Boranementioning

confidence: 99%

Ammonia Borane: An Extensively Studied, Though Not Yet Implemented, Hydrogen Carrier

Demirci

2020

Energies

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“…• Metal-mediated decomposition basically should not depend on the specific crystal structure (no Li diffusion and mass transport of other constituents). In contrast, α and β phases of LiAB show clearly different parameters of hydrogen desorption 17 ; • The presence of ammonia is claimed in some studies 11,18,19 while there are studies 13,20 reporting no emission or very little amounts of ammonia during thermal decomposition of lithium amidoborane; • No plausible explanation of the endothermic process occurring in material prior to the rapid emission of molecular hydrogen. In the literature it is frequently called a state of melting, however a detailed description of the material structure at this state is lacking 19 .…”

Section: Experimental and Theoretical Evidence Of Dihydrogen Bonds Inmentioning

confidence: 99%

“…Metal-mediated decomposition basically should not depend on the specific crystal structure (no Li diffusion and mass transport of other constituents). In contrast, α and β phases of LiAB show clearly different parameters of hydrogen desorption 17 ;…”

Section: Introductionmentioning

confidence: 96%

“…This make elucidation of the role of metal hydride hypothetically formed during thermal decomposition less obvious 11 , 12 ; Hydrogen release performance of lithium amidoborane–ammonia borane complex LiAB·AB is significantly improved if compared to pure lithium amidoborane 13 , 14 ; Liberation of hydrogen from AB is notably enhanced in ionic liquids and in the presence of acids 15 , 16 ; Metal-mediated decomposition basically should not depend on the specific crystal structure (no Li diffusion and mass transport of other constituents). In contrast, α and β phases of LiAB show clearly different parameters of hydrogen desorption 17 ; The presence of ammonia is claimed in some studies 11 , 18 , 19 while there are studies 13 , 20 reporting no emission or very little amounts of ammonia during thermal decomposition of lithium amidoborane; No plausible explanation of the endothermic process occurring in material prior to the rapid emission of molecular hydrogen. In the literature it is frequently called a state of melting, however a detailed description of the material structure at this state is lacking 19 .…”

Section: Introductionmentioning

confidence: 99%

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Experimental and theoretical evidence of dihydrogen bonds in lithium amidoborane

Magos-Palasyuk

Litwiniuk

Taras

2020

Sci Rep

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In situ high-pressure synchrotron X-ray diffraction, Raman scattering, and complementary first-principles calculations have revealed that structural and spectroscopic properties of lithium amidoborane compound are largely determined by multiple heteropolar dihydrogen bonds. The crystal structure of the compound is stabilized by dimeric complexes, wherein molecular ions bind together by intermolecular dihydrogen bonds of unconventional type. This strong intermolecular coupling determines stable character of the crystal structure in the pressure range up to ~ 30 GPa and is spectroscopically manifested by pronounced changes related to molecular vibrations of the amino group: the splitting of stretching modes, the anomalous behavior of wagging modes as well as Fermi resonance due to vibrational coupling of bending and stretching modes, significantly enhanced above 10 GPa. Unconventional nature of dihydrogen bonds is confirmed by the frequency increase, blueshift, of NH stretching modes with pressure. A role of certain hydrogen mediated interactions in the process of dehydrogenation of ammonia borane and its alkali metal derivatives is speculated. Findings presented here call for reconsideration of hydrogen release mechanism from alkali metal ammonia borane derivatives. The work makes significant contribution towards establishing the general theory of ubiquitous and versatile hydrogen mediated interactions.

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“…Both allotropes have an orthorhombic unit cell with a Pbca space group, but the lattice parameters of β-LiAB are almost twice the ones of the α-LiAB. Liu et al [259] analyzed the dehydrogenation of each allotrope. α-LiAB presents the lowest onset temperature (61 • C) and β-LiAB the highest (76 • C).…”

Section: Monometallic Amidoboranesmentioning

confidence: 99%

Destabilization of Boron-Based Compounds for Hydrogen Storage in the Solid-State: Recent Advances

et al. 2021

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Boron-based materials have been widely studied for hydrogen storage applications. Examples of these compounds are borohydrides and boranes. However, all of these present some disadvantages that have hindered their potential application as hydrogen storage materials in the solid-state. Thus, different strategies have been developed to improve the dehydrogenation properties of these materials. The purpose of this review is to provide an overview of recent advances (for the period 2015–2021) in the destabilization strategies that have been considered for selected boron-based compounds. With this aim, we selected seven of the most investigated boron-based compounds for hydrogen storage applications: lithium borohydride, sodium borohydride, magnesium borohydride, calcium borohydride, ammonia borane, hydrazine borane and hydrazine bisborane. The destabilization strategies include the use of additives, the chemical modification and the nanosizing of these compounds. These approaches were analyzed for each one of the selected boron-based compounds and these are discussed in the present review.

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Dehydrogenation properties of two phases of LiNH2BH3

Cited by 8 publications

References 34 publications

Ammonia Borane: An Extensively Studied, Though Not Yet Implemented, Hydrogen Carrier

Ammonia Borane: An Extensively Studied, Though Not Yet Implemented, Hydrogen Carrier

Experimental and theoretical evidence of dihydrogen bonds in lithium amidoborane

Destabilization of Boron-Based Compounds for Hydrogen Storage in the Solid-State: Recent Advances

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