Effects of rare-earth element additions to Laves phase-related body-centered-cubic solid solution metal hydride alloys: Thermodynamic and electrochemical properties

Kong, Lingan; Li, Xinhai; Kim, Young; Nei, Jean; Liao, Xingqun; Li, Wenliang

doi:10.1016/j.jallcom.2017.12.058

Cited by 15 publications

(3 citation statements)

References 53 publications

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“…Rare earth (RE) metals react with hydrogen consequitively forming di-and trihydrides, while the hydrogenation affects magnetic and electronic properties as related to the hydrogen content in the hydride phase. Studies on individual RE metals and their alloys have attracted many investigators and were focused on the development of their applications as the components of the hydrogen storage materials [1], metal hydride battery anodes [2,3], and gas sensors [4]. Practical importance of the RE hydrides is also related to the Hydrogenation-Disproportionation-Desorption-Recombination (HDDR) process in RE-containing MeeH systems allowing manufacturing of REeFeeB permanent magnets with high energy product [5].…”

Section: Introductionmentioning

confidence: 99%

Thermal desorption spectroscopy studies of hydrogen desorption from rare earth metal trihydrides REH3 (RE=Dy, Ho, Er)

Suwarno

Lototskyy

Yartys

2020

Journal of Alloys and Compounds

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Rare earth (RE) metals form two stoichiometric hydrides, REH 2 and REH 3 , and for the yttrium group of RE transformation of a FCC (REH 2) into an HCP (REH 3) lattice takes place during the second step of hydrogenation REH 2 þ ½ H 2 / REH 3. Earlier studies of the hydrogen desorption properties of the rare earth hydrides were limited to Y and RE ¼ La, Ce, Pr, Nd, Sm, Gd, Tb and Er. The present work is focused on the studies of the kinetics and mechanism of hydrogen desorption from trihydrides of heavy rare earths, DyH 3 , HoH 3, and ErH 3. The Thermal Desorption Spectroscopy (TDS) studies were performed at pressures below 1 Â 10 À5 mbar during linear heating from room temperature to 1173 K at different heating rates ranging from 1 to 5.5 K/min. Hydrogen desorption traces show the presence of two main events with the low-temperature peak appearing below 573 K, while the second peak is positioned at 1083e1159 K, with the peak temperatures gradually increasing following the rise of the heating rate. Fitting of the peak temperatures in the TDS spectra using the Kissinger method yielded activation energies of hydrogen desorption for both hydrogen desorption events. For DyH 3 and ErH 3 , the shapes of the TDS spectra appear to be well described by a phase-stuctural transformation following a model of nucleation and growth, while for HoH 3 the dehydrogenation mechanism includes a phase boundary reaction. This applied model of phase-structural transformations shows differences in dimensionality and rate-limiting steps as related to the studied compound and the desorption events, REH 3 / REH 2 or REH 2 / RE.

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Section: Introductionmentioning

confidence: 99%

Thermal desorption spectroscopy studies of hydrogen desorption from rare earth metal trihydrides REH3 (RE=Dy, Ho, Er)

Suwarno

Lototskyy

Yartys

2020

Journal of Alloys and Compounds

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“…Typically, battery anode AB2-type alloys consist of Zr and Ti on the A site together with a variable combination of transition metals, including V, Cr, Mn, Ni and Fe on the B site [6]. Up till now, the effect of various additives on hydrogen absorption-desorption and electrochemical properties of the AB2 alloys such as Titanium [7,8], Lanthanum [9], Yttrium [10,11], Cerium [12], Praseodymium [13], Neodymium [14], Nickel [15], Molybdenum [16,17], Zinc [18], Aluminum [19], Manganese [20], Vanadium [21], Iron [22,23], Silicon [24] have been extensively studied and documented in the reference publications.…”

Section: Introductionmentioning

confidence: 99%

Study of hydrogen storage and electrochemical properties of AB2-type Ti0.15Zr0.85La0.03Ni1.2Mn0.7V0.12Fe0.12 alloy

Володин

Denys

Wan

et al. 2019

Journal of Alloys and Compounds

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A C15 AB2 Laves-type Ti0.15Zr0.85La0.03Ni1.2Mn0.7V0.12Fe0.12 alloy was prepared by arc melting and annealing. Phase-structural composition, microstructure, hydrogen absorption-desorption properties, thermodynamic and electrochemical performances were characterized by X-ray diffraction, scanning electron microscopy, hydrogen absorption-desorption measurements and electrochemical characterization and were related to the use of the alloys as metal hydride battery anodes.The alloy contains a C15 FCC intermetallic compound as the main phase and a LaNi secondary phase as the minor constituent (~ 1 wt.%).During the electrochemical tests, the anode electrodes quickly, after just a few activation cycles, reached a maximum discharge capacity. This was related to the catalytic effect of the La-rich secondary phase which acted as a catalyst of hydrogen absorption-desorption.Annealing resulted in increase of the maximum discharge capacity from 345 mAh/g for the as cast alloy to 370 mAh/g. Furthermore, the annealed alloy showed a better high rate dischargeability and a higher cyclic stability. After 100 cycles with 100% DOD at discharge current density of 1 C, the discharge capacity of the annealed alloy was very high, at a level of 90 % of the initial capacity.The rates of hydrogen diffusion have been characterized by Potentiostatic Intermittent Titration Technique and Electrochemical Impedance Spectroscopy. With increasing an extent of transformation into the hydride, the H diffusion rate in the bulk of the alloy particles decreased. The maximum value of DH measured by PITT for the annealed alloy was observed for the nearly fully discharged electrode, (SOC 2 %).

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“…Ni-MH batteries have been used to power millions of hybrid electric vehicles. 1 Recently a group of metal hydrides called "the Laves phase related body-centered-cubic (BCC) solid solution alloy" [2][3][4][5] has received more attention due their interesting kinetic and thermodynamic performance as negative electrodes for electric vehicles applications. 6 Iba & Akiba 7 described the importance of interface phase's energy distributions in these alloys for the final stability.…”

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confidence: 99%

Thermodynamic Analysis of AB₂ Hydrides: ZrCr_1-xTi_xNiMo_0.3 Alloys

Téliz

Díaz

Piganelli

et al. 2018

J. Electrochem. Soc.

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A thermodynamic analysis was performed on the role of titanium substitution in ZrCr 1-x Ti x NiMo 0.3 (Ti; x = 0.3, 0.5, 0.7) AB 2 type alloys. The hysteresis in hydride/deshydruration processes was calculated from electrochemical isotherms as a dimensionless parameter related to yield strengths and hydrogen partial molar volumes. Zr 0.7 Ti 0.3 Cr 0.7 Mo 0.3 Ni samples exhibited large hysteresis, i.e. 1.6, but the lowest hydrogen molar volume (2.19 cm 3 mol −1 ) and the greater yield strength (10.0 × 10 6 N cm −2 ). Thus, the amount of titanium has to be carefully dosed to avoid large fractures and low hydrogen dosages. The multiphase formation was explained by Pm-3m and Im-3m space groups, the first one describing TiNi phase and the second one CrMo phase segregation. A brief evaluation of the thermodynamic works and non-compensated heats was also conducted. On one hand, the largest maximum and real work were obtained from Zr 0.7 Ti 0.3 Cr 0.7 Mo 0.3 Ni, between 700 and 800 J g −1 , although TiNi dissipates the lowest irreversible heat, −1 J, for attaining only half of the ideal and real works, between ca. 370 and 400 J g −1 . In summary, the presence of low amounts of titanium as those in Zr 0.7 Ti 0.3 Cr 0.7 Mo 0.3 Ni alloys balance well the electrochemical hydruration process with the mechanical and thermodynamic stability.

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Effects of rare-earth element additions to Laves phase-related body-centered-cubic solid solution metal hydride alloys: Thermodynamic and electrochemical properties

Cited by 15 publications

References 53 publications

Thermal desorption spectroscopy studies of hydrogen desorption from rare earth metal trihydrides REH3 (RE=Dy, Ho, Er)

Thermal desorption spectroscopy studies of hydrogen desorption from rare earth metal trihydrides REH3 (RE=Dy, Ho, Er)

Study of hydrogen storage and electrochemical properties of AB2-type Ti0.15Zr0.85La0.03Ni1.2Mn0.7V0.12Fe0.12 alloy

Thermodynamic Analysis of AB₂ Hydrides: ZrCr_1-xTi_xNiMo_0.3 Alloys

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Effects of rare-earth element additions to Laves phase-related body-centered-cubic solid solution metal hydride alloys: Thermodynamic and electrochemical properties

Cited by 15 publications

References 53 publications

Thermal desorption spectroscopy studies of hydrogen desorption from rare earth metal trihydrides REH3 (RE=Dy, Ho, Er)

Thermal desorption spectroscopy studies of hydrogen desorption from rare earth metal trihydrides REH3 (RE=Dy, Ho, Er)

Study of hydrogen storage and electrochemical properties of AB2-type Ti0.15Zr0.85La0.03Ni1.2Mn0.7V0.12Fe0.12 alloy

Thermodynamic Analysis of AB2 Hydrides: ZrCr1-xTixNiMo0.3 Alloys

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Thermodynamic Analysis of AB₂ Hydrides: ZrCr_1-xTi_xNiMo_0.3 Alloys