Stress effect on the swelling/shrinking behavior of an AB2 alloy during hydrogenation cycles

Escobar, Ane; Chaise, A.; Iosub, V.; Salque, B.; Fernández, José Francisco; Gillia, O.

doi:10.1016/j.ijhydene.2017.03.145

Cited by 16 publications

(5 citation statements)

References 23 publications

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“…4 back-scattered electron images of the alloys can be seen. As described in previous works with alloys of similar composition [43,51], the sample is mainly composed by a mixture of two distinctive areas (light and dark presented in table 1 and shown in Fig. 4) with different compositions.…”

Section: Fig3 X-ray Diffractograms With Rietveld Refinement Of M1 M2 and M3mentioning

confidence: 84%

“…Also, considerations and constraints have been taken into account for the simulation: (1) The scheme of the whole system (Fig. 1) involves three stages of compression, and an external vessel volume (V ext ) connected to the third stage where the H 2 will be compressed to; (2) the P in generates directly the minimum concentration in the beta phase (β min ) in each hydride at RT; (3) the desorption point (pressure and hydrogen content in the P-c-I) at each stage will be the one corresponding to the maximum concentration in the alpha phase (α max ), and, its pressure (P des ) would have to be equal or greater than the absorption pressure (P abs ) of the following stage at RT; (4) The final desorption point, at the third stage, will determine the optimum high temperature value (HT) that enhances the CR and final number of H 2 moles compressed (n H2-C ); (5) A 65% filling density of the hydrogenated material density is used taking into account former studies on these type of materials [43]; (6) the mass (m) and volume (SVol) of the reactor at each stage are also linked to V ext where the H 2 will be compressed, hence, this volume will be another parameter to vary in order to observed its effect in the quantity of mass and reactor volumes at each stage; (7) the hydride is in thermal equilibrium with the surrounding gas; (8) a dead volume was considered at each stage due to connection tubes, valves and others (15.4(5) cm 3 /stage); ( 9) real H 2 gas EOS is also implemented [40].…”

Section: Second Numerical Approachmentioning

confidence: 99%

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Simulation and design of a three-stage metal hydride hydrogen compressor based on experimental thermodynamic data

Leardini

Ares

et al. 2018

International Journal of Hydrogen Energy

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A semi-empirical method was developed to design a three stage Metal Hydride Hydrogen Compressor (MHHC) through the determination of thermodynamic properties of several hydrides. As a first step, three AB 2 -type alloys that satisfy operation conditions were selected from published thermodynamic data entailing over 200 single plateau hydrides. These alloys were synthetized by arc melting and characterized by X-Ray Powder Diffraction (XRPD), Scanning Electron Microscopy (SEM) and Energy Dispersion X-ray spectroscopy (EDX). Absorption and desorption Pressure-composition-Isotherms (P-c-I) were determined between 23 and 80 ºC to characterize their thermodynamic properties. Subsequently, an algorithm that uses these experimental data and a real equation of state for gaseous H 2 was implemented to simulate the volume, alloy mass, pressure and temperature of operation for each compressor stage, while optimizing the compression ratio and total number of compressed H 2 moles. Optimal desorption temperatures for the three stages were identified within the range of 110 to 132 °C. A system compression ratio (CR) of 92 was achieved. The number of H 2 moles compressed, the alloy mass and volume of each stage depend linearly on the volume of the external tank in which the hydrogen is delivered.

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Section: Fig3 X-ray Diffractograms With Rietveld Refinement Of M1 M2 and M3mentioning

confidence: 84%

Section: Second Numerical Approachmentioning

confidence: 99%

Simulation and design of a three-stage metal hydride hydrogen compressor based on experimental thermodynamic data

Leardini

Ares

et al. 2018

International Journal of Hydrogen Energy

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“…Empiric analysis of the interrelations between the alloy composition and thermodynamic properties of its interaction with gaseous H 2 was presented in refs [28,37,38,48,49]. Several articles consider cycle stability of AB 5, 22,45 AB 2, 30,32 and BCC 39,41,42 alloys for hydrogen compression, surface state and activation of AB 2, 31,34 as well as stress effects caused by swelling/shrinking of the MH materials during cyclic hydrogenation/dehydrogenation 27 . In some works, the materials research was supplemented by the tests of their hydrogen compression performances in prototype MH containers 33,43 or in compressor assembly 45 …”

Section: Hydrogen Compression Using Metal Hydridesmentioning

confidence: 99%

“…Most of the articles related to hydrogen compression materials and published since 2015 consider multi‐component C14‐AB 2±x intermetallics where A = Ti or Ti + Zr and B = Cr, Fe, V, Mn 27‐38 . Certain attention has been paid to BCC alloys in V–Ti–Cr system, 39‐43 multiphase C14 + BCC Ti–V–Mn alloys, 44 as well as AB 5 ‐type intermetallics 22,45,46 .…”

Section: Hydrogen Compression Using Metal Hydridesmentioning

confidence: 99%

Thermally driven hydrogen compression using metal hydrides

Lototskyy

Linkov

2022

Intl J of Energy Research

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Summary Hydrogen compression is a major contributor to capital costs and maintenance hours in the infrastructure related to storage, distribution and end‐use of hydrogen. Conventionally used mechanical hydrogen compressors have a number of disadvantages including a complicated design, insufficient reliability, high operating costs, a probability of hydrogen leakage and hydrogen contamination. A promising alternative is a thermally driven metal hydride hydrogen compressor (MHHC) whose operation is based on the reversible interaction of hydride‐forming alloys with hydrogen gas. MHHCs have a number of advantages including practically unlimited (up to several kbars) discharge pressure, good scalability (from several normal litres to tens normal cubic metres of hydrogen per an hour), modular design, simplicity in service and operation, as well as high purity of the delivered hydrogen and a possibility to use low‐grade heat. MHHC does not contain moving parts that simplifies its design, increases reliability, and eliminates noise and vibration. This article overviews applied R&D activities related to the thermally driven hydrogen compression using metal hydrides. The focus is put on the interrelation between properties of metal hydride materials and their hydrogen compression performances, first of all, operating pressure ‐ temperature range, process productivity, and efficiency. Typical design features of the hydrogen compression systems and ways of their optimization are considered. A brief techno‐economic analysis of the MHHCs benchmarked against alternative hydrogen compression technologies (mechanical and electrochemical) is presented as well. Finally, promising application niches of the MHHCs are outlined.

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“…A suitable hydrogen storage material has to fulfil a series of characteristics: high volumetric and gravimetric storage capacity, equilibrium conditions near ambient pressure and temperature, fast reaction rate, high cyclability, etc. In addition to these characteristics, related to physico-chemical properties of the material, there are engineering aspects that must be addressed in order to use hydride forming alloys in large scales: cost [1e4], heat management [5,6], hydrogen flow [7] and the containment of the micrometric hydrogen storage material [8]. One of these engineering aspects is how to deal with the swelling of the storage material powder during the absorption process.…”

Section: Introductionmentioning

confidence: 99%