Nanoconfinement effects on hydrogen storage properties of MgH2 and LiBH4

Le, Thi-Thu; Pistidda, Claudio; Nguyen, Van Huy; Singh, Pardeep; Klassen, Thomas; Dornheim, Martin

doi:10.1016/j.ijhydene.2021.04.150

Cited by 53 publications

(13 citation statements)

References 194 publications

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“…Due to its wide availability in nature, low cost, high gravimetric (7.6 wt.%) and volumetric (110 g/L) hydrogen storage capacities, the binary hydride, MgH 2 , is arguably the most studied metal hydride and Mg-based materials have been investigated exhaustively by a variety of research groups (Table 11) [34,43,47,53,55,57,61,65,77,78,80,92,94,95,98,102,103,109,110,115,118,121,122,124,130,134,137,146,147,149,158,[168][169][170]172,177,196,198,201,202,204,205,[208][209][210][211][212]…”

Section: Mghmentioning

confidence: 99%

Recent Development in Nanoconfined Hydrides for Energy Storage

Comănescu

2022

IJMS

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Hydrogen is the ultimate vector for a carbon-free, sustainable green-energy. While being the most promising candidate to serve this purpose, hydrogen inherits a series of characteristics making it particularly difficult to handle, store, transport and use in a safe manner. The researchers’ attention has thus shifted to storing hydrogen in its more manageable forms: the light metal hydrides and related derivatives (ammonia-borane, tetrahydridoborates/borohydrides, tetrahydridoaluminates/alanates or reactive hydride composites). Even then, the thermodynamic and kinetic behavior faces either too high energy barriers or sluggish kinetics (or both), and an efficient tool to overcome these issues is through nanoconfinement. Nanoconfined energy storage materials are the current state-of-the-art approach regarding hydrogen storage field, and the current review aims to summarize the most recent progress in this intriguing field. The latest reviews concerning H2 production and storage are discussed, and the shift from bulk to nanomaterials is described in the context of physical and chemical aspects of nanoconfinement effects in the obtained nanocomposites. The types of hosts used for hydrogen materials are divided in classes of substances, the mean of hydride inclusion in said hosts and the classes of hydrogen storage materials are presented with their most recent trends and future prospects.

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Section: Mghmentioning

confidence: 99%

Recent Development in Nanoconfined Hydrides for Energy Storage

Comănescu

2022

IJMS

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“…Perhaps one of the most studied metal borohydrides of the main groups, LiBH 4 , ( 1 in Figure 8 ) crystallizes in the orthorhombic Pnma space group, with cell dimensions a = 7.1785 Å, b = 4.4368 Å, c = 6.8032 Å, and V = 216.685(3) Å 3 at 20 °C. While early diffraction data of lower resolution suggesting strong distortion of the BH 4 tetrahedra, more recent determinations show that B-H bonds and H-B-H angles practically describe perfect tetrahedrons [ 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ]. Each Li + cation coordinates four [BH 4 ] − tetrahedra, and each [BH 4 ] − tetrahedron coordinates four Li + cations.…”

Section: Structural Considerations Of M(bh 4 ) ...mentioning

confidence: 99%

“…From a structural point of view, borohydrides M(BH 4 ) x are ionic/covalent compounds formed by a metal center (M x+ ) that binds accordingly to the negatively charged borohydride tetrahedra BH 4 − . The lightest member of the borohydride family is LiBH 4 , depicted in Figure 3 [ 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ]. Established by synchrotron XRD at RT, LiBH 4 shows at normal conditions an orthorhombic symmetry ( Pnma ), with the BH 4 tetrahedra aligned along two orthogonal directions.…”

Section: Introductionmentioning

confidence: 99%

“…Synthetic strategies and structure characterization [ 21 ] have been complemented by in-depth studies on hydrolysis process of light borohydrides [ 22 , 24 , 25 , 27 ] or by investigation on the possible intermediates that dehydrogenation could entail [ 12 ]. Destabilization strategies employed to tame the rigid behavior of tetrahydroborates during hydrogenation cycles have been reviewed [ 30 , 31 , 32 , 33 , 34 ], and the field of ionic conductivity has been explored with aplomb especially after the discovery of LT(low temperature)–HT(high temperature) phase transition in lithium borohydride [ 36 , 37 , 38 ]. The current review aims to gather most areas of interest regarding the fascinating chemistry of complex borohydrides and bring them under one umbrella, considering the historical evolution of the field, important milestones, and current and emerging trends.…”

Section: Introductionmentioning

confidence: 99%

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Complex Metal Borohydrides: From Laboratory Oddities to Prime Candidates in Energy Storage Applications

Comănescu

2022

Materials

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Despite being the lightest element in the periodic table, hydrogen poses many risks regarding its production, storage, and transport, but it is also the one element promising pollution-free energy for the planet, energy reliability, and sustainability. Development of such novel materials conveying a hydrogen source face stringent scrutiny from both a scientific and a safety point of view: they are required to have a high hydrogen wt.% storage capacity, must store hydrogen in a safe manner (i.e., by chemically binding it), and should exhibit controlled, and preferably rapid, absorption–desorption kinetics. Even the most advanced composites today face the difficult task of overcoming the harsh re-hydrogenation conditions (elevated temperature, high hydrogen pressure). Traditionally, the most utilized materials have been RMH (reactive metal hydrides) and complex metal borohydrides M(BH4)x (M: main group or transition metal; x: valence of M), often along with metal amides or various additives serving as catalysts (Pd2+, Ti4+ etc.). Through destabilization (kinetic or thermodynamic), M(BH4)x can effectively lower their dehydrogenation enthalpy, providing for a faster reaction occurring at a lower temperature onset. The present review summarizes the recent scientific results on various metal borohydrides, aiming to present the current state-of-the-art on such hydrogen storage materials, while trying to analyze the pros and cons of each material regarding its thermodynamic and kinetic behavior in hydrogenation studies.

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“…However, the unfavorably high thermal stability and sluggish dehydrogenation kinetics significantly limit its practical application ( Luo et al, 2019 ; Zhang et al, 2020a ). Many attempts have been carried out to improve the dehydrogenation and rehydrogeantion properties of MgH 2 , including alloying ( Hardian et al, 2018 ; Hui et al, 2020 ; Ali and Ismail, 2021 ), nanoengineering ( Zhang et al, 2020a ; Zhang et al, 2021c ; Thi Thu et al, 2021 ), and catalyst addition ( Zhong et al, 2018 ; Li et al, 2019b ; Liu et al, 2020b ; Zhang et al, 2020b ; Ding et al, 2020 ; Singh et al, 2020 ; Sun et al, 2020 ; Wang and Deng, 2020 ; Yao et al, 2020 ; Zeng et al, 2020 ; Zhu et al, 2020 ; Lu et al, 2021a ; Lu et al, 2021b ; Liu et al, 2021c ; Liu et al, 2021 ), etc. Li is also a H-absorbing metal and has a hydrogen capacity of 11.5 wt.%.…”

Section: Introductionmentioning

confidence: 99%

Co-Addition of Mg2Si and Graphene for Synergistically Improving the Hydrogen Storage Properties of Mg−Li Alloy

et al. 2021

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Mg−Li alloy possesses a high hydrogen capacity. However, the hydrogenation and dehydrogenation performances are still far from practical application. In this work, Mg2Si (MS) and graphene (G) were employed together to synergistically improve the hydrogen storage properties of Mg−Li alloy. The structures of the samples were studied by XRD and SEM methods. The hydrogen storage performances of the samples were studied by nonisothermal and isothermal hydrogenation and dehydrogenation, thermal analysis, respectively. It is shown that the onset dehydrogenation temperature of Mg−Li alloy was synergistically reduced from 360°C to 310°C after co-addition of Mg2Si and graphene. At a constant temperature of 325°C, the Mg−Li−MS−G composite can release 2.7 wt.% of hydrogen within 2 h, while only 0.2 wt.% of hydrogen is released for the undoped Mg−Li alloy. The hydrogenation activation energy of the Mg−Li−MS−G composite was calculated to be 86.5 kJ mol−1. Microstructure and hydrogen storage properties studies show that graphene can act as a grinding aid during the ball milling process, which leads to a smaller particle size for the composites. This work demonstrates that coaddition of Mg2Si and graphene can synergistically improve the hydrogen storage properties of Mg−Si alloy and offers an insight into the role of graphene in the Mg−Li−MS−G composite.

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Nanoconfinement effects on hydrogen storage properties of MgH2 and LiBH4

Cited by 53 publications

References 194 publications

Recent Development in Nanoconfined Hydrides for Energy Storage

Recent Development in Nanoconfined Hydrides for Energy Storage

Complex Metal Borohydrides: From Laboratory Oddities to Prime Candidates in Energy Storage Applications

Co-Addition of Mg2Si and Graphene for Synergistically Improving the Hydrogen Storage Properties of Mg−Li Alloy

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