Decomposition Behavior of Eutectic LiBH4–Mg(BH4)2 and Its Confinement Effects in Ordered Nanoporous Carbon

Liu, Xiangfeng; Peaslee, David; Sheehan, Thomas; Majzoub, Eric H.

doi:10.1021/jp509708t

Cited by 32 publications

(18 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[189][190][191] In one case, the eutectic LiBH 4 -Ca(BH 4 ) 2 was successfully infiltrated into mesoporous carbon, and the positive effects of nanoconfinement were observed through the enhanced hydrogen desorption and absorption properties, improving the hydrogen storage performance of the device. With this, the effects of confinement and the interaction between the template pattern and the solidifying eutectic (for surface-selective nucleation) can be combined to tailor the assembly of the phaseseparating components.…”

Section: Template-directed Solidification Of Eutectic Materialsmentioning

confidence: 99%

“…To infiltrate LiBH 4 into porous materials, it was helpful to form eutectic mixtures, as this decreases the melting point and thus the required temperatures for melt infiltration. [189][190][191] In one case, the eutectic LiBH 4 -Ca(BH 4 ) 2 was successfully infiltrated into mesoporous carbon, and the positive effects of nanoconfinement were observed through the enhanced hydrogen desorption and absorption properties, improving the hydrogen storage performance of the device. [189] Perhaps not surprisingly, it has been observed that the nanoconfinement of eutectic materials within a porous template leads to slight modifications in the phase diagram and melting characteristics as interaction between the eutectic melt and the template surface changes the overall thermodynamics of the system.…”

Section: Template-directed Solidification Of Eutectic Materialsmentioning

confidence: 99%

See 1 more Smart Citation

Template‐Directed Solidification of Eutectic Optical Materials

Kulkarni

Kohanek

Tyler

et al. 2018

Advanced Optical Materials

View full text Add to dashboard Cite

polarizers, some waveguides, and many lasers. [1][2][3] Materials with powerful optical functionalities, including negative-index of refraction and optical chirality, can be realized by appropriate placement of materials with suitable properties in 2D or 3D space. [4][5][6] Light in the visible spectrum can be manipulated, although the tolerance for defects is exceedingly low at visible frequencies, and the number of materials with the appropriate properties is limited. [7,8] Most photonic crystals are fabricated by high-resolution top-down 2D patterning methods such as electron-beam lithography, interference lithography, and focused ion beam milling. [9] However, it is challenging to fabricate large-area bulk materials with these techniques, especially with intricate internal structures. [8] Additionally, many materials with promising optical properties are not compatible with these top-down patterning methods. [4,10] As work on colloidal crystals has shown, controlled self-assembly is an effective route to organizing materials into 3D architectures, which interact strongly with light. [9][10][11][12][13] Colloidal self-assembly, however, only offers a limited set of symmetries (generally those of close packed arrangements), and a spherical basis. [12] For many applications, considerably more complex structures are of interest. Particularly promising approaches for forming materials with complex internal microstructures include eutectic solidification and block copolymer self-assembly, [14][15][16][17] and materials with interesting optical properties have been reported using both approaches. These methods are advantageous due to the wide range of microstructures they form. Here, we focus on the structures formed by eutectic solidification since materials with a broader range of optical properties are available compared to that provided by block copolymers, and because the characteristic lengths of structures accessible through eutectic solidification better match the wavelengths of visible and IR light. Further, forming materials with sufficiently large characteristic dimensions for interaction with visible light by block copolymer assembly is synthetically challenging as it requires high molecular weight polymers. [18] Similarly, self-assembly of other building blocks, e.g., nanoparticles, [19,20] molecules, [21,22] and DNA, [23,24] tend to produce structures with characteristic dimensions too small to provide strong light-matter interactions (via diffractive phenomena), [2,3,25] and are thus not the emphasis of this review.Mesostructured materials can exhibit enhanced light-matter interactions, which can become particularly strong when the characteristic dimensions of the structure are similar to or smaller than the wavelength of light. For controlling visible to near-infrared wavelengths, the small characteristic dimensions of the required structures usually demand fabrication by sophisticated lithographic techniques. However, these fabrication methods are restricted to producing 2D and a limited range of 3D...

show abstract

Section: Template-directed Solidification Of Eutectic Materialsmentioning

confidence: 99%

Section: Template-directed Solidification Of Eutectic Materialsmentioning

confidence: 99%

Template‐Directed Solidification of Eutectic Optical Materials

Kulkarni

Kohanek

Tyler

et al. 2018

Advanced Optical Materials

View full text Add to dashboard Cite

show abstract

“…. Many eutectics are formed at a different molar fraction composition, from a temperature as low as 105 °C for 0.725LiBH 4 ‐0.275KBH 4 ,, 216 °C for 0.70LiBH 4 ‐0.30NaBH 4 ,, 150 °C for 0.55LiBH 4 ‐0.45Mg(BH 4 ) 2 , and 200 °C for 0.68LiBH 4 ‐0.32Ca(BH 4 ) 2 ,. In binary combinations without LiBH 4 , thermal minima or partial melting have been observed, at 462 °C for 0.682NaBH 4 ‐0.328KBH 4 , 205 °C for 0.40NaBH 4 ‐0.60Mg(BH 4 ) 2 , and above 350 °C for the NaBH 4 ‐Ca(BH 4 ) 2 system .…”

Section: Introductionmentioning

confidence: 99%

Exploring Ternary and Quaternary Mixtures in the LiBH₄‐NaBH₄‐KBH₄‐Mg(BH₄)₂‐Ca(BH₄)₂ System

et al. 2019

View full text Add to dashboard Cite

Binary combinations of borohydrides have been extensivly investigated evidencing the formation of eutectics, bimetallic compounds or solid solutions. In this paper, the investigation has been extended to ternary and quaternary systems in the LiBH 4 -NaBH 4 -KBH 4 -Mg(BH 4 ) 2 -Ca(BH 4 ) 2 system. Possible interactions among borohydrides in equimolar composition has been explored by mechanochemical treatment. The obtained phases were analysed by X-ray diffraction and the thermal behaviour of the mixtures were analysed by HP-DSC and DTA, defining temperature of transitions and decomposition reactions. The release of hydrogen was detected by MS, showing the role of the presence of solid solutions and multi-cation compounds on the hydrogen desorption reactions. The presence of LiBH 4 generally promotes the release of H 2 at about 200°C, while KCa (BH 4 ) 3 promotes the release in a single-step reaction at higher temperatures.The explorative investigation has evidenced the formation of bi/tri-metallic compounds such as KCa(BH 4 ) 3 , LiKMg(BH 4 ) 4 and LiK(BH 4 ) 2 . The relative thermodynamic stabilities of these compounds have been discussed in the present study. Many new ternary eutectics have been observed with a melting temperature in the range from 100°C to 140°C, much lower than the melting temperature of parent binary eutectics. The hydrogen desorption occurs from the liquid phase, via complex multi-steps reactions but with no significant differences compared to the quinary equimolar mixture previously investigated.

show abstract

“…Examples of cationic solid solutions in binary borohydrides are limited to the Mg(BH 4 ) 2 -Zn(BH 4 ) 2 [170], Mg(BH 4 ) 2 -Mn(BH 4 ) 2 [28], LiBH 4 -NaBH 4 [152] and NaBH 4 -KBH 4 [27] systems. In other cases, a nearly full immiscibility is observed [153,156,[186][187][188][189][190][191][192], suggesting structural and electronic constrains in the formation of solid solution in cationic sublattice in the case of borohydrides. Considering the LiBH 4 -NaBH 4 -KBH 4 system, LiBH 4 can form a cubic phase with limited solid solubility in NaBH 4 and KBH 4 .…”

Section: Solid Phasesmentioning

confidence: 99%

Complex hydrides for energy storage

Milanese

Jensen

Hauback

et al. 2019

International Journal of Hydrogen Energy

153

View full text Add to dashboard Cite

In the past decades, complex hydrides and complex hydrides-based materials have been thoroughly investigated as materials for energy storage, owing to their very high gravimetric and volumetric hydrogen capacities and interesting cation and hydrogen diffusion properties. Concerning hydrogen storage, the main limitations of this class of materials are the high working temperatures and pressures, the low hydrogen absorption and desorption rates and the poor cycleability. In the past years, research in this field has been focused on understanding the sorption mechanism of the pristine and catalysed materials and on the characterization of the thermodynamic aspects, in order to rationally choose the composition and the stoichiometry of the systems in terms of hydrogen active phases and catalysts/destabilizing agents. Moreover, new materials have been discovered and characterized in an attempt to find systems with properties suitable for practical on-board and *Manuscript Click here to view linked References stationary applications. A significant part of this rich and productive activity has been performed by the research groups led by Experts of the International Energy Agreement Task 32, often in collaborative research projects. The most recent findings of these joint activities and other noteworthy recent results in the field are reported in this paper.

show abstract

Decomposition Behavior of Eutectic LiBH₄–Mg(BH₄)₂ and Its Confinement Effects in Ordered Nanoporous Carbon

Cited by 32 publications

References 49 publications

Template‐Directed Solidification of Eutectic Optical Materials

Template‐Directed Solidification of Eutectic Optical Materials

Exploring Ternary and Quaternary Mixtures in the LiBH₄‐NaBH₄‐KBH₄‐Mg(BH₄)₂‐Ca(BH₄)₂ System

Complex hydrides for energy storage

Contact Info

Product

Resources

About

Decomposition Behavior of Eutectic LiBH4–Mg(BH4)2 and Its Confinement Effects in Ordered Nanoporous Carbon

Cited by 32 publications

References 49 publications

Template‐Directed Solidification of Eutectic Optical Materials

Template‐Directed Solidification of Eutectic Optical Materials

Exploring Ternary and Quaternary Mixtures in the LiBH4‐NaBH4‐KBH4‐Mg(BH4)2‐Ca(BH4)2 System

Complex hydrides for energy storage

Contact Info

Product

Resources

About

Decomposition Behavior of Eutectic LiBH₄–Mg(BH₄)₂ and Its Confinement Effects in Ordered Nanoporous Carbon

Exploring Ternary and Quaternary Mixtures in the LiBH₄‐NaBH₄‐KBH₄‐Mg(BH₄)₂‐Ca(BH₄)₂ System