Reaction kinetics of H2, O2, and H2O with rare earths (Y, La, Ce, Pr, Nd, Gd, Tb, Dy, and Er) at 298K

The electrochemical behavior of hydride‐forming A2B7 alloys (Y2Ni7, LaSmNi7, and Gd2Ni7) is investigated in KOH solution. The evolution of the material performance is shown to strongly depend on the A elements. Electrochemical impedance spectroscopy (EIS), SEM observations, XRD, and Raman spectroscopy showed that Y2Ni7 is mainly sensitive to calendar corrosion and decrepitation, whereas LaSmNi7 and Gd2Ni7 are sensitive to the concomitant effect of both cycling and calendar corrosion. It is also shown that the capacity loss of Gd2Ni7 can be ascribed to amorphization on cycling, which is not the case for Y2Ni7. The formation of both an thin oxide film (a few tens of nanometers thick) at the material surface, measured by EIS, and the dissolution products formed during long‐term immersion, analyzed by Raman spectroscopy, is in agreement with the decrease in material activity evaluated by EIS during cycling at different depths of charge.

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Electrochemical Properties and Dissolution Mechanism of A₂Ni₇ Hydrides (A=Y, Gd, La–Sm)

Puga

Joiret

Vivier

et al. 2015

ChemElectroChem

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(Y, Gd)H2 phase formation in as-cast Mg-6Gd-3Y-0.5Zr alloy

Wang

Wang³

et al. 2021

China Foundry

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In this work, a new (Y, Gd)H 2 precipitate was identified and systematically investigated in the ascast Mg-6Gd-3Y-0.5Zr alloy by XRD, SEM with EDS, TEM with EDS techniques and thermodynamics analysis. Results show that the as-cast alloy contains α-Mg, Mg 24 (Gd, Y) 5 , and (Y, Gd)H 2 phase. The (Y, Gd)H 2 phase usually forms near the eutectic phase Mg 24 (Gd, Y) 5 or in the α-Mg grains, displaying a rectangle-shape. The Mg 24 (Gd, Y) 5 and (Y, Gd)H 2 phases crystalize in bcc and fcc structure, respectively, and the (Y, Gd)H 2 phase has a semi-coherent relationship with α-Mg matrix. The thermodynamics calculation results reveal that the hydrogen dissolved in the melt leads to the formation of hydrides. It is also found that the (Y, Gd)H 2 hydride can form directly from the liquid phase during solidification. Additionally, it can precipitate by the decomposition of Mg 24 (Gd, Y) 5 phase due to absorbing hydrogen from the remaining melt.

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Hydrogen absorption in Mg-Gd alloy

Vlček

Čı́žek

Lukáč

et al. 2017

International Journal of Hydrogen Energy

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Reaction kinetics of H2, O2, and H2O with rare earths (Y, La, Ce, Pr, Nd, Gd, Tb, Dy, and Er) at 298K

Cited by 8 publications

References 15 publications

Electrochemical Properties and Dissolution Mechanism of A₂Ni₇ Hydrides (A=Y, Gd, La–Sm)

Electrochemical Properties and Dissolution Mechanism of A₂Ni₇ Hydrides (A=Y, Gd, La–Sm)

(Y, Gd)H2 phase formation in as-cast Mg-6Gd-3Y-0.5Zr alloy

Hydrogen absorption in Mg-Gd alloy

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Reaction kinetics of H2, O2, and H2O with rare earths (Y, La, Ce, Pr, Nd, Gd, Tb, Dy, and Er) at 298K

Cited by 8 publications

References 15 publications

Electrochemical Properties and Dissolution Mechanism of A2Ni7 Hydrides (A=Y, Gd, La–Sm)

Electrochemical Properties and Dissolution Mechanism of A2Ni7 Hydrides (A=Y, Gd, La–Sm)

(Y, Gd)H2 phase formation in as-cast Mg-6Gd-3Y-0.5Zr alloy

Hydrogen absorption in Mg-Gd alloy

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Electrochemical Properties and Dissolution Mechanism of A₂Ni₇ Hydrides (A=Y, Gd, La–Sm)

Electrochemical Properties and Dissolution Mechanism of A₂Ni₇ Hydrides (A=Y, Gd, La–Sm)