Nanostructured and Complex Hydrides for Hydrogen Storage

Jepsen, Lars H.; Paskevicius, Mark; Jensen, Torben R.

doi:10.1002/9783527696109.ch18

Cited by 9 publications

(10 citation statements)

References 105 publications

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“…Considering the hydride, while the stability of binary metal hydrides (M–H) is dominated by the charge transfer between the metal and the hydrogen atoms, , complex metal hydrides (LiBH 4 , NaAlH 4 , and Mg 2 FeH 6 ) are composed of metal cations and polyatomic anions containing hydrogen. In these complexes ([BH 4 ] − , [AlH 4 ] − , and [FeH 6 ] 4– ), the hydrogen is covalently bonded with a δ + /δ – polarity . Although the bond energy of the M–H diatomic (M = B, Al) indicates that the B–H and Al–H bonds have strong covalent character, the ionic bound between the nonmetal hydrogen complex ([BH 4 ] − , [AlH 4 ] − ) and the alkali or alkaline earth metal must be considered .…”

Section: Introductionmentioning

confidence: 99%

“…45,46 Considering the hydride, while the stability of binary metal hydrides (M−H) is dominated by the charge transfer between the metal and the hydrogen atoms, 3,47 − ), the hydrogen is covalently bonded with a δ + /δ − polarity. 48 Although the bond energy of the M−H diatomic (M = B, Al) indicates that the B−H and Al−H bonds have strong covalent character, the ionic bound between the nonmetal hydrogen complex ([BH 4 ] − , [AlH 4 ] − ) and the alkali or alkaline earth metal must be considered. 49 Complex hydrides present a dual situation with an ionic bond and covalent bonds, whose sensibility toward nanoconfinement is distinct as steric influence affects little the arrangement of ions.…”

Section: Introductionmentioning

confidence: 99%

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N-Doped Graphene-Rich Aerogels Decorated with Nickel and Cobalt Nanoparticles: Effect on Hydrogen Storage Properties of Nanoconfined LiBH₄

et al. 2019

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We present the decoration of N-doped graphene entangled in mesoporous carbon by nickel and/or cobalt nanoparticles. The textural properties of the mesoporous materials were characterized by nitrogen desorption isotherms. The materials presented metallic nanoparticles of at least 20 nm and diffraction peaks typical of cubic cobalt or nickel. Transmission microscopy revealed the presence of graphene layers, organized mostly in an onionlike fashion around the metallic nanoparticles, suggesting that these might promote the formation of extra graphene sheets from the surrounding amorphous carbon. The formation of a metallic alloy when nickel and cobalt were mixed is strongly suggested. Differential scanning calorimetry of these materials filled with LiBH4 demonstrated that the presence of nanoparticles displaced the typical transition, melting, and decomposition peaks of this hydride toward lower temperatures. Volumetric studies revealed that the liberation of hydrogen started at lower temperatures when nanoparticles were present, slowing down at higher temperatures. Cobalt-decorated materials liberated 8 wt % H2 at 325 °C during the first cycle (with 1 wt % released at 226 °C). After rehydrogenation at 400 °C, the materials decorated with nickel liberated 8 wt % H2, a 2 wt % excess compared to that of the nondecorated materials.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

N-Doped Graphene-Rich Aerogels Decorated with Nickel and Cobalt Nanoparticles: Effect on Hydrogen Storage Properties of Nanoconfined LiBH₄

et al. 2019

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“…Various types of solid materials have shown the capability for hydrogen storage in a specific working condition [3,4]. High pressure and low temperature is required to store hydrogen in metal-organic frameworks (MOF) [5,6], while other types of materials such as metal hydrides or complex hydrides [7][8][9][10][11][12], and in some cases a mixture of these compounds [13][14][15], can be applied as storage materials at ambient conditions.…”

Section: Introductionmentioning

confidence: 99%

Dehydrogenation properties of the LiNH2BH3/MgH2 and LiNH2BH3/LiBH4 bi-component hydride systems for hydrogen storage applications

Ghaani

Catti

2018

Mater Renew Sustain Energy

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Lithium amidoborane (LiAB) is known as an efficient hydrogen storage material. The dehydrogenation reaction of LiAB was studied employing temperature-programmed desorption methods at varying temperature and H 2 pressure. As the dehydrogenation products are in amorphous form, the XRD technique is not useful for their identification. The two-step decomposition temperatures (74 and 118 °C) were found to hardly change in the 1-80 bar pressure range. This is related either to kinetic effects or to thermal dependence of the reaction enthalpy. Further, the possible joint decomposition of LiNH 2 BH 3 with LiBH 4 or MgH 2 was investigated. Indeed LiBH 4 proved to destabilize LiAB, producing a 10 °C decrease of the first-step decomposition temperature, whereas no significant effect was observed by the addition of MgH 2. The 5LiNH 2 BH 3 + LiBH 4 assemblage shows improved hydrogen storage properties with respect to pure lithium amidoborane.

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“…This mixture could be hydrogenated to form LiBH 4 and MgH 2 at 5 MPa and 350 to 400 °C. Although due to slow kinetics of both the processes, the catalyst like Nb 2 O 5 is utilized, giving storage capacity of 7 wt % and TiCl 3 giving storage capacity around 9.1 wt % . Another well-known and most investigated borohydride is sodium borohydride (NaBH 4 ), which easily dissolve in an alkaline solution of sodium hydroxide (NaOH) to release molecular hydrogen.…”

Section: Hydrogen Transportation and Storagementioning

confidence: 96%

Hydrogen Economy and Role of Hythane as a Bridging Solution: A Perspective Review

2021

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Molecular hydrogen is the most optimistic solution for achieving a carbon-neutral energy economy, and it requires scientific intervention for its production, storage, and transportation. In the present time, hydrogen is produced primarily from conventional fossil fuels. Hydrogen production from natural gas using partial oxidation and steam reforming processes is a relatively mature process. However, several modifications and improvements are being researched. Hydrogen generation from potential renewable and biological sources such as water splitting and biomass conversion are propitious approaches. Hydrogen is one of the smallest molecules, and the volumetric efficiency of its storage is quite poor. The creative and innovative ways for molecular hydrogen storage, including pressurized, liquified, physically adsorbed, chemically adsorbed, and in the form of gas hydrates, are being investigated. The delay in developing a systematic and mature hydrogen economy is mainly due to challenging storage conditions and the safety aspect of its transportation. Hythane, a patented mixture of hydrogen and natural gas, can act as a bridge for the hydrogen economy by sharing the current natural gas infrastructure. This review delivers an extensive understanding of the properties of hythane fuel with a brief history. Hydrogen addition can increase NO x emissions due to exceptional heat generation that can be solved to a certain extent with the approach of inventive technologies developed for internal combustion engines, including three-way catalyst, lean burn combustion, exhaust gas recirculation (EGR), and direct fuel injection (DFI).

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Nanostructured and Complex Hydrides for Hydrogen Storage

Cited by 9 publications

References 105 publications

N-Doped Graphene-Rich Aerogels Decorated with Nickel and Cobalt Nanoparticles: Effect on Hydrogen Storage Properties of Nanoconfined LiBH₄

N-Doped Graphene-Rich Aerogels Decorated with Nickel and Cobalt Nanoparticles: Effect on Hydrogen Storage Properties of Nanoconfined LiBH₄

Dehydrogenation properties of the LiNH2BH3/MgH2 and LiNH2BH3/LiBH4 bi-component hydride systems for hydrogen storage applications

Hydrogen Economy and Role of Hythane as a Bridging Solution: A Perspective Review

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Nanostructured and Complex Hydrides for Hydrogen Storage

Cited by 9 publications

References 105 publications

N-Doped Graphene-Rich Aerogels Decorated with Nickel and Cobalt Nanoparticles: Effect on Hydrogen Storage Properties of Nanoconfined LiBH4

N-Doped Graphene-Rich Aerogels Decorated with Nickel and Cobalt Nanoparticles: Effect on Hydrogen Storage Properties of Nanoconfined LiBH4

Dehydrogenation properties of the LiNH2BH3/MgH2 and LiNH2BH3/LiBH4 bi-component hydride systems for hydrogen storage applications

Hydrogen Economy and Role of Hythane as a Bridging Solution: A Perspective Review

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Product

Resources

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N-Doped Graphene-Rich Aerogels Decorated with Nickel and Cobalt Nanoparticles: Effect on Hydrogen Storage Properties of Nanoconfined LiBH₄

N-Doped Graphene-Rich Aerogels Decorated with Nickel and Cobalt Nanoparticles: Effect on Hydrogen Storage Properties of Nanoconfined LiBH₄