Recent advances in the 18-electron complex transition metal hydrides of Ni, Fe, Co and Ru

Humphries, Terry D.; Sheppard, Drew A.; Buckley, Craig E.

doi:10.1016/j.ccr.2017.04.001

Cited by 47 publications

(27 citation statements)

References 127 publications

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Section: Introductionmentioning

confidence: 99%

“…For instance, Rusman and Dahari reviewed the current progress in metal hydride materials, such as intermetallic alloys, alanates, borohydrides, and nitrides, for hydrogen storage applications . Humphries et al summarized recent advances in the molecular structures, thermodynamic properties, and other physical properties of a set of transition metal hydrides containing Ni, Fe, Co, and Ru . George and Saxena reviewed the structural properties of various metal hydrides in conjunction with their thermodynamic properties .…”

Section: Introductionmentioning

confidence: 99%

“…In addition to individual studies, several reviews have comprehensively evaluated such studies, and considerable efforts have been made to review advances in the properties of individual metal hydrides for hydrogen storage applications. 2,[43][44][45][46][47][48] For instance, Rusman and Dahari reviewed the current progress in metal hydride materials, such as intermetallic alloys, alanates, borohydrides, and nitrides, for hydrogen storage applications. 2 Humphries et al summarized recent advances in the molecular structures, thermodynamic properties, and other physical properties of a set of transition metal hydrides containing Ni, Fe, Co, and Ru.…”

Section: Introductionmentioning

confidence: 99%

“…2 Humphries et al summarized recent advances in the molecular structures, thermodynamic properties, and other physical properties of a set of transition metal hydrides containing Ni, Fe, Co, and Ru. 43 George and Saxena reviewed the structural properties of various metal hydrides in conjunction with their thermodynamic properties. 47 Andreasen provided a review of the hydrogenation properties of various Mg-Al alloys with a focus on the thermodynamic and kinetic properties associated with hydride formation.…”

Section: Introductionmentioning

confidence: 99%

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A review on design strategies for metal hydrides with enhanced reaction thermodynamics for hydrogen storage applications

Kim

2017

Int J Energy Res

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Summary Hydrogen is an alternative clean energy carrier that can replace current fossil fuels for vehicular applications. Thus, it is important to develop a method that would enable a high density of hydrogen to be stored safely under the operating conditions of polymer electrolyte membrane fuel cells. Even though metal hydrides are regarded as promising candidates that can safely store a high density of hydrogen, their stable nature makes it difficult for them to release hydrogen at mild temperatures in the range of 50 to 150°C. In this review, 3 primary strategies, namely, introduction of appropriate dopants, particle size control, and design of novel reactant mixtures based on high‐throughput screening methods, are briefly described with the aim of evaluating the potential of metal hydrides for hydrogen storage applications. The review suggests that successful development of promising hydrogen storage systems will depend on collaborative introduction of these 3 primary design strategies through the combined utilization of experimental and computational techniques to overcome the major challenges associated with the reaction thermodynamics of metal hydrides.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A review on design strategies for metal hydrides with enhanced reaction thermodynamics for hydrogen storage applications

Kim

2017

Int J Energy Res

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“…As reported in refs. 3,6 , [FeD 6 ] 4− shows one stretching band, while [CoD 5 ] 4− shows two bands, which reflect the octahedral and square-base pyramidal symmetry, respectively. They appear in the same frequency range.…”

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confidence: 99%

Synthesis and characterization of Magnesium-Iron-Cobalt complex hydrides

Barale

Deledda

Dematteis

et al. 2020

Sci Rep

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The formation, structure and deuterium desorption properties of Mg 2 fe x co (1−x) D y (0 ≤ x ≤ 1 and 5 ≤ y ≤ 6) complex hydrides were investigated. The synthesis was carried out by reactive ball milling, using a mixture of powders of the parent elements in D 2 atmosphere. The formation of quaternary deuterides was identified from Rietveld refinements of powder X-Ray diffraction and powder neutron diffraction patterns, and from infrared attenuated total reflectance analysis. It was observed that the crystal structure of deuterides depends on the transition metal fraction. For Co-rich compositions, i.e. up to x = 0.1, hydrides have the tetragonal distorted CaF 2-type structure (space group P4/nmm) of Mg 2 coD 5 at room temperature. For Fe-rich compositions, i.e. x ≥ 0.5, a cubic hydride is observed, with the same K 2 ptcl 6-type structure (space group Fm3m) as Mg 2 feD 6 and as Mg 2 coD 5 at high temperatures. for x = 0.3, both the cubic and the tetragonal deuterides are detected. Differential scanning calorimetry coupled with thermogravimetric and temperature programmed desorption analyses show rather similar deuterium desorption properties for all samples, without significant changes as a function of composition. Finally, hydrogen sorption experiments performed for Mg 2 fe 0.5 co 0.5 H 5.5 at 30 bar of H 2 and 673 K showed reversible reactions, with good kinetic for both absorption and desorption of hydrogen. Hydrogen is a promising energy carrier, but technologies for its storage must be improved for its use in a large scale. The purpose of research on hydrogen storage is to achieve high gravimetric and volumetric capacities at mild pressure and temperature conditions. In this regard, hydrogen storage in hydrides is particularly favourable 1. Mg is an attractive hydrogen storage material, due to its low cost and high gravimetric (7.7 H 2 wt.%) and volumetric (110 gH 2 l −1) capacity in MgH 2. However, MgH 2 is a rather stable hydride and its desorption temperature is too high (>573 K) for most practical applications. To reduce the desorption temperature and increase the kinetics of both absorption and desorption, different strategies have been investigated, such as the introduction of defects, the reduction of particles size (e.g. with mechanochemical techniques) and the use of additives (e.g. 3d transition metals and their oxides) 2. Mg-based hydrides containing 3d transition metals (TM), e.g. Ni, Fe and Co, have shown lower hydrogen sorption temperature and improved kinetics, compared to MgH 2. Mg 2 FeH 6 and Mg 2 CoH 5 have high gravimetric (5.6 and 4.5 H 2 wt.%, respectively) 3 and volumetric (150 and 110 gH 2 l −1 , respectively) capacity 4. The crystal structure of both these ternary hydrides is based on the formation of complex anions obeying the 18-electron rule and with a strong covalent bond between TM and hydrogen. In Mg 2 FeH 6 , the octahedral complex anion [FeH 6 ] 4− is surrounded by eight Mg 2+ in a cubic rearrangement. The crystal structure is a cubic K 2 PtCl 6-type (space group Fm3m), with un...

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Hydrido‐Komplexe des Calciums: eine neue Familie molekularer Erdalkalimetall‐Verbindungen

2018

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Die Anwendung von festem CaH2 beschränkt sich fast ausschließlich auf die Nutzung als Trockenmittel, obwohl eine katalytische Aktivität lange bekannt ist. Nach der Isolierung der ersten definierten molekularen Calciumhydrid‐Verbindung im Jahr 2006 ist die Zahl an Mitgliedern dieser neuen Verbindungsklasse im folgenden Jahrzehnt stetig gestiegen. Zwar erschwert das Schlenk‐Gleichgewicht die Isolierung dieser Verbindungen, jedoch hat die Neuartigkeit der Reaktivität, besonders bei der Aktivierung kleiner Moleküle, immer mehr Interesse geweckt. In diesem Kurzaufsatz wird umfassend über die Synthese, Struktur und Reaktivität der bis dato bekannten molekularen Calciumhydride berichtet.

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Recent advances in the 18-electron complex transition metal hydrides of Ni, Fe, Co and Ru

Cited by 47 publications

References 127 publications

A review on design strategies for metal hydrides with enhanced reaction thermodynamics for hydrogen storage applications

A review on design strategies for metal hydrides with enhanced reaction thermodynamics for hydrogen storage applications

Synthesis and characterization of Magnesium-Iron-Cobalt complex hydrides

Hydrido‐Komplexe des Calciums: eine neue Familie molekularer Erdalkalimetall‐Verbindungen

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