Eutectic Phenomenon of LiNH2-KH Composite in MH-NH3 Hydrogen Storage System

Goshome, Kiyotaka; Jain, Ankur; Miyaoka, Hiroki; Yamamoto, Hikaru; Kojima, Yoshiyuki; Ichikawa, Takayuki

doi:10.3390/molecules24071348

Cited by 5 publications

(3 citation statements)

References 52 publications

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“…Although research on applications of amides/imides for hydrogen storage materials is still progressing [283][284][285][286][287][288][289][290][291][292][293], most recent efforts have been focused on their application as catalysts or co-catalysts in ammonia synthesis and decomposition, as solid-state electrolytes for batteries, and novel amide/imides with multifunctional energy applications [285,[294][295][296][297][298][299][300][301][302]. For instance, by ball milling mixtures of lithium amide, lithium imide and lithium nitride-hydride, Makepeace et al [296] recently reported an amide-imide solid solution with wide-ranging anion compositions.…”

Section: Amides and Imidesmentioning

confidence: 99%

Hydrogen storage in complex hydrides: past activities and new trends

et al. 2022

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Intense literature and research efforts have focussed on the exploration of complex hydrides for energy storage applications over the past decades. A focus was dedicated to the determination of their thermodynamic and hydrogen storage properties, due to their high gravimetric and volumetric hydrogen storage capacities, but their application has been limited because of harsh working conditions for reversible hydrogen release and uptake. The present review aims at appraising the recent advances on different complex hydride systems, coming from the proficient collaborative activities in the past years from the research groups led by the experts of the Task 40 “Energy Storage and Conversion Based on Hydrogen” of the Hydrogen Technology Collaboration Programme of the International Energy Agency. An overview of materials design, synthesis, tailoring and modelling approaches, hydrogen release and uptake mechanisms and thermodynamic aspects are reviewed to define new trends and suggest new possible applications for these highly tuneable materials.

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Section: Amides and Imidesmentioning

confidence: 99%

Hydrogen storage in complex hydrides: past activities and new trends

et al. 2022

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“…The LiNH 2 -KH composite system was explored in our recent work, and the ammonolysis rate was greatly improved. The reaction product was discovered to be a double-cation amide phase LiK(NH 2 ) 2 [24,25]. Because of the eutectic melting phenomena, the reaction temperature was determined to be lower than the individual melting points of LiNH 2 and KH.…”

Section: Introductionmentioning

confidence: 99%

Pseudo-Binary Phase Diagram of LiNH2-MH (M = Na, K) Eutectic Mixture

et al. 2022

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The hunt for a cleaner energy carrier leads us to consider a source that produces no toxic byproducts. One of the targeted alternatives in this approach is hydrogen energy, which, unfortunately, suffers from a lack of efficient storage media. Solid-state hydrogen absorption systems, such as lithium amide (LiNH2) systems, may store up to 6.5 weight percent hydrogen. However, the temperature of hydrogenation and dehydrogenation is too high for practical use. Various molar ratios of LiNH2 with sodium hydride (NaH) and potassium hydride (KH) have been explored in this paper. The temperature of hydrogenation for LiNH2 combined with KH and NaH was found to be substantially lower than the temperature of individual LiNH2. This lower temperature operation of both LiNH2-NaH and LiNH2-KH systems was investigated in depth, and the eutectic melting phenomenon was observed. Systematic thermal studies of this amide-hydride system in different compositions were carried out, which enabled the plotting of a pseudo-binary phase diagram. The occurrence of eutectic interaction increased atomic mobility, which resulted in the kinetic modification followed by an increase in the reactivity of two materials. For these eutectic compositions, i.e., 0.15LiNH2-0.85NaH and 0.25LiNH2-0.75KH, the lowest melting temperature was found to be 307 °C and 235 °C, respectively. Morphological studies were used to investigate and present the detailed mechanism linked with this phenomenon.

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“…A hydrogen storage alloy (HSA) has a characteristic that its volume increases with absorbing hydrogen. The swelling is undesirable for applications such as hydrogen storage [1], rechargeable batteries [2], and heat pumps [3] since it causes pulverization and deformation of a tank surrounding the hydrogen storage alloy. Therefore, hydrogen storage alloys for these applications are designed to have a small swelling ratio.…”

Section: Introductionmentioning

confidence: 99%

Suitability Evaluation of LaNi5 as Hydrogen-Storage-Alloy Actuator by In-Situ Displacement Measurement during Hydrogen Pressure Change

et al. 2019

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The swelling ability of LaNi5 for application to hydrogen-storage-alloy (HSA) actuator is discussed through the measurement of the swelling ratio in hydrogen. The HSA actuator is driven by hydrogen pressure change causing the swelling of HSA. LaNi5 is one of the candidate materials for HSA actuators as well as palladium. Some prototypes of HSA actuators using LaNi5 have been fabricated; however, the kinetic swelling ability of LaNi5 itself has been not investigated. In this paper, the authors investigated the static and kinetic swelling ability of LaNi5 powder under hydrogen atmosphere. The results showed that the swelling ratio increased by 0.12 at the phase transition pressure. Response time decreased with an increase in the charged pressure during absorption, while it remained constant during discharge. Reaction kinetics revealed that these swelling behaviors were explained by hydrogen absorption and lattice expansion. The swelling ability of LaNi5 was also compared with that of palladium. The results show that LaNi5 swells 1.8 times more than palladium under 0.5 MPa. LaNi5 is suitable for an actuator driven repeatedly under more than the phase transition pressure. Palladium can be used for one-way-operation actuator even under 0.1 MPa since its response time during the evacuation was much longer than during the pressurization.

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Eutectic Phenomenon of LiNH2-KH Composite in MH-NH3 Hydrogen Storage System

Cited by 5 publications

References 52 publications

Hydrogen storage in complex hydrides: past activities and new trends

Hydrogen storage in complex hydrides: past activities and new trends

Pseudo-Binary Phase Diagram of LiNH2-MH (M = Na, K) Eutectic Mixture

Suitability Evaluation of LaNi5 as Hydrogen-Storage-Alloy Actuator by In-Situ Displacement Measurement during Hydrogen Pressure Change

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