Hydrogen sorption properties of MgH2–LiBH4 composites

Bösenberg, Ulrike; Doppiu, Stefania; Mosegaard, Lene; Barkhordarian, Gagik; Eigen, N.; Borgschulte, Andreas; Jensen, Torben R.; Cerenius, Yngve; Gutfleisch, Oliver; Klassen, Thomas; Dornheim, Martin; Bormann, R.

doi:10.1016/j.actamat.2007.03.010

Cited by 355 publications

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“…XRD and volumetric data 15 show that H 2 sorption reactions in the LiBH 4 -MgH 2 RHC system are nearly complete in the bulk and fully reversible in the conditions employed in the present paper ͑400°C and 5 bar for desorption and 350°C and 50 bar for absorption͒. In previous works [20][21][22] it has been also demonstrated that the Ti based additive is present after ball milling as Ti oxide like species whereas upon cycling the additive migrates to the bulk as a mix of TiB 2 and Ti 2 O 3 species.…”

Section: Discussionmentioning

confidence: 99%

“…Desorption and absorption reactions were performed, respectively, at 400°C and 350°C under 5 and 50 bar hydrogen. 15 Preparation and handling were performed under continuously purified argon or nitrogen atmosphere in glove boxes.…”

Section: A Sample Preparationmentioning

confidence: 99%

“…First MgH 2 desorbs and forms Mg. After an incubation period the LiBH 4 decomposes leading simultaneously to the formation of LiH and MgB 2 with additional hydrogen release. 15,16 It has been demonstrated that MgB 2 formation is the key for the reversibility. 14,17 To reach the DOE requirements, the dehydrogenation/hydrogenation of the system needs to be improved to reduce the incubation period as well as the overall reaction kinetics.…”

Section: Introductionmentioning

confidence: 99%

“…14 The organometallic compound titanium isopropoxide ͑Ti-iso͒ was found to be one of the most efficient additives for this system. 15,16 Additionally the initial activation and mixing of materials and additives by high energy ball milling is also contributing strongly to kinetic improvement. 15,16 The characterization of the additives in the initial and cycled composites was a first step toward understanding the function of additives and the mechanism of H 2 sorption reactions.…”

Section: Introductionmentioning

confidence: 99%

“…15,16 Additionally the initial activation and mixing of materials and additives by high energy ball milling is also contributing strongly to kinetic improvement. 15,16 The characterization of the additives in the initial and cycled composites was a first step toward understanding the function of additives and the mechanism of H 2 sorption reactions. [18][19][20][21] It has been demonstrated that additives evolve during milling and/or first desorption to form metal boride nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

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Combined x-ray photoelectron spectroscopy and scanning electron microscopy studies of the LiBH4–MgH2 reactive hydride composite with and without a Ti-based additive

Deprez

Muñoz‐Márquez

Haro

et al. 2011

Journal of Applied Physics

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A detailed electronic and microstructural characterization is reported for the LiBH4–MgH2 reactive hydride composite system with and without titanium isopropoxide as additive. Surface characterization by x-ray photoelectron spectroscopy combined to a morphological study by scanning electron microscopy as well as elemental map composition analysis by energy dispersive x-ray emission are presented in this paper for the first time for all sorption steps. Although sorption reactions are not complete at the surface due to the unavoidable superficial oxidation, it has been shown that the presence of the additive is favoring the heterogeneous nucleation of the MgB2 phase. Ti-based phases appear in all the samples for the three sorption steps well dispersed and uniformly distributed in the material. Li-based phases are highly dispersed at the surface while the Mg-based ones appear, either partially covered by the Li-based phases, or forming bigger grains. Ball milling is promoting mixing of phases and a good dispersion of the additive what favors grain refinement and heterogeneous reactions at the interfaces.

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Section: Discussionmentioning

confidence: 99%

Section: A Sample Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Combined x-ray photoelectron spectroscopy and scanning electron microscopy studies of the LiBH4–MgH2 reactive hydride composite with and without a Ti-based additive

Deprez

Muñoz‐Márquez

Haro

et al. 2011

Journal of Applied Physics

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Newly Emerging 2D MXenes for Hydrogen Storage

Lavate,

Lokesh,

Srivastava

2024

MXenes

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Tailoring Reaction Enthalpies of Hydrides

Dornheim¹

2010

Handbook of Hydrogen Storage

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In view of the future use of hydrogen as a renewable fuel for mobile and stationary applications the development of cost and energy efficient, safe and reliable hydrogen storage technologies enabling high volumetric and gravimetric storage densities remains one of the most challenging tasks.One major advantage of metal hydrides is the ability to store hydrogen in a very energy efficient way enabling hydrogen storage at rather low pressures without further need for liquefaction or compression. However, depending on the hydrogen reaction enthalpy of the specific storage material during hydrogen uptake, a huge amount of heat (equivalent to 15% or more of the energy stored in hydrogen) can be generated and has to be removed in a rather short time. On the other hand, during desorption the same amount of heat has to be applied to facilitate the endothermic hydrogen desorption process. If, in the case of stationary applications, during hydrogen uptake the generated amount of heat is stored and used for desorption again, or if, in the case of mobile applications, it is used as process heat for applications near to a filling station, the highest energy efficiencies of the whole hydrogen storage tank-utilization system can be accomplished, see Figure 7.1.In most mobile applications fast recharging of a hydrogen storage tank ought to be possible within only a few minutes. If a 4 kg hydrogen storage tank based on conventional room temperature hydrides with reaction enthalpies of around DH ¼ 30 kJ (mol H 2 ) À1 is considered, like in the case of FeTiH 2 (À28 kJ (mol H 2 ) À1 for TiFeH and À35 kJ (mol H 2 ) À1 for TiFeH 2Àx , Buchner [1]) or LaNi 5 (DH ¼ À31 kJ (mol H 2 ) À1 ) about 60 MJ heat is thereby produced. This value increases still further if more stable medium-or even high-temperature metal hydrides/complex hydrides are chosen. Therefore, it is desirable to develop materials with high storage capacities as well as moderate reaction heats. MgH 2 is an example of a high-temperature metal hydride with a high gravimetric storage capacity and a large value of reaction enthalpy. It has a formation enthalpy of DH ¼ À75 kJ (mol H 2 ) À1 and thus during Handbook of Hydrogen Storage. Edited by Michael Hirscher

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Hydrogen sorption properties of MgH2–LiBH4 composites

Cited by 355 publications

References 14 publications

Combined x-ray photoelectron spectroscopy and scanning electron microscopy studies of the LiBH4–MgH2 reactive hydride composite with and without a Ti-based additive

Combined x-ray photoelectron spectroscopy and scanning electron microscopy studies of the LiBH4–MgH2 reactive hydride composite with and without a Ti-based additive

Newly Emerging 2D MXenes for Hydrogen Storage

Tailoring Reaction Enthalpies of Hydrides

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