Effects of substituting Cu for Sn on the microstructure and hydrogen absorption properties of Co-free AB5 alloys

Casini, Júlio César Serafim; Silva, Franks Martins; Guo, Zaiping; Liu, Huan; Faria, Rubens Nunes de; Takiishi, Hidetoshi

doi:10.1016/j.ijhydene.2016.07.107

Cited by 18 publications

(7 citation statements)

References 17 publications

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“…Probably, increasing the unpaired d-electron by substitution of other elements and increasing the volume of unit cells does not have a strong effect on the stored content of hydrogen. Similar conclusions were also shown in other works. ,,− It is possible that the highest published value of c g (2.2 wt % H 2 ) was not caused by the beneficial influence of Fe, but the sorption capacity was influenced by hydrogen absorption in the material of the reactor cell itself, which is made almost always from stainless steel . The decrease of the maximum hydrogen capacity of the experimental alloys was mainly caused by the formation of nonhydride phases (such as FeNi), which reduces the content of LaNi-based phases because of the ability to form hydrides in these materials.…”

Section: Resultssupporting

confidence: 85%

“…A similar effect has also been observed in various LaNi 5 -based alloys such as LaNi 4.8 Al 0.2 , LaNi 4.6 Si 0.4 , LaNi 4.6 Sn 0.4 , and LaNi 4.75 Fe 0.25 (Table ). ,,− ,− Nevertheless, iron and cobalt have a lower potential to affect hydride stability and hydrogen pressure than Al, Si, or Sn . However, in the studied alloys Fe7 SC and Fe12 SC with similar matrix cell volumes, the p eq value of alloy Fe12 SC was significantly decreased.…”

Section: Resultsmentioning

confidence: 91%

“…and desorption (des.) seem to be sufficient materials for hydrogen storage. , For these reasons, the AB 5 -type LaNi 5 -based metallic hydride (A-rare earth element, B-transition metal, or p-block element) alloys can be considered as prospective HS materials. These materials have been extensively studied for HS applications or as materials for electrodes in nickel-metal hydride batteries. , They are characterized by the unique kinetics and thermodynamics of HS .…”

Section: Introductionmentioning

confidence: 99%

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Influence of Fe on the Hydrogen Storage Properties of LaCeNi Alloys

Král

Chesalkin²,

Čermák

et al. 2023

Langmuir

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LaNi 5 intermetallic compounds with a hexagonal CaCu 5 type structure can react reversibly with hydrogen. The element substitutions in LaNi 5 can significantly change the hydrogenation properties, allowing to tune them to a large extent. It could be very advantageous to partially replace Ni or La with other elements to reduce the cost of this alloy as well as the equilibrium pressure of absorption and desorption. The hydrogen storage properties of ball-milled AB 5 alloys containing the elements La, Ce (A-rare elements) and Ni, Fe (B-transition metals) were studied in this paper. Although the substitution of Ni (atomic radius 1.49 Å) with Fe atom (atomic radius 1.56 Å) increased the unit cell volume from 86.4149 to 87.947 5 Å 3 of the LaNi 5 phase, its hydrogen storage capacity was still close to the value 1.4 wt %. The enthalpy (ΔH) of hydride formation for hydrogen absorption and desorption of the experimental alloys was in the range of 29−32.6 kJ/mol. A very favorable effect of Fe on the sorption properties was found in the significant reduction of the equilibrium pressure of absorption and desorption. These studied experimental Fe-containing alloys were able to store hydrogen at 300 K and with pressure under 0.1 MPa. The fastest sorption kinetics of hydrogen was found in alloys with FeNi phase particles located on the surface of the powder. However, if the FeNi phase was segregated at the grain boundaries, it acted as a barrier limiting the growth of the hydride phase. This led to a decrease of the hydride sorption kinetics.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Influence of Fe on the Hydrogen Storage Properties of LaCeNi Alloys

Král

Chesalkin²,

Čermák

et al. 2023

Langmuir

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“…The first ones are easily mitigated by an adequate adjustment of the external conditions such as hydrogen quality or by avoiding high working temperatures. Furthermore, intrinsic degradation is difficult to eliminate and remains a major research challenge, such as disproportionation [13], amorphisation [14], generation of stable phases [10], or oxidation, among others [5,9,17,18].…”

Section: Correlation Between Tank Degradation and Model Physical Para...mentioning

confidence: 99%

“…However, there are little information and data to support these possible mechanisms [16]. For this reason, many research efforts are being made with the intention of improving the performance of hydride metals under the effect of the passage of the cycles [5,9,17,18].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Performance Degradation of a Metal Hydride Tank in a Real Fuel Cell Electric Vehicle

et al. 2022

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In a fuel cell electric vehicle (FCEV) powered by a metal hydride tank, the performance of the tank is an indicator of the overall health status, which is used to predict its behaviour and make appropriate energy management decisions. The aim of this paper is to investigate how to evaluate the effects of charge/discharge cycles on the performance of a commercial automotive metal hydride hydrogen storage system applied to a real FCEV. For this purpose, a mathematical model is proposed based on uncertain physical parameters that are identified using the stochastic particle swarm optimisation (PSO) algorithm combined with experimental measurements. The variation of these parameters allows an assessment of the degradation level of the tank’s performance on both the quantitative and qualitative aspects. Simulated results derived from the proposed model and experimental measurements were in good agreement, with a maximum relative error of less than 2%. The validated model was used to establish the correlations between the observed degradations in a hydride tank recovered from a real FCEV. The results obtained show that it is possible to predict tank degradations by developing laws of variation of these parameters as a function of the real conditions of the use of the FCEV (number of charging/discharging cycles, pressures, mass flow rates, temperatures).

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Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems

Rong

Yao

et al. 2022

J Mater Sci

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Effects of substituting Cu for Sn on the microstructure and hydrogen absorption properties of Co-free AB5 alloys

Cited by 18 publications

References 17 publications

Influence of Fe on the Hydrogen Storage Properties of LaCeNi Alloys

Influence of Fe on the Hydrogen Storage Properties of LaCeNi Alloys

Evaluation of the Performance Degradation of a Metal Hydride Tank in a Real Fuel Cell Electric Vehicle

Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems

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