Molybdenum incorporation on AB2 alloys-part I metallurgical and electrochemical characterization: Electrocatalytic behavior

Téliz, Erika; Diez, Joaquin; Faccio, Ricardo; Ruiz, Fabricio; Zinola, Fernando; Díaz, Verónica

doi:10.1016/j.jallcom.2018.02.154

Cited by 9 publications

(13 citation statements)

References 46 publications

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“…The characterization by X-ray powder diffraction (XRD) was performed and results reported in a previous work. 15,[31][32] The physical techniques prove the presence of a segregated Zr x Ni y phase, as well as hexagonal C14 structures. The partial replacement of chromium by molybdenum promotes the isolation of a Zr x Ni y phase (Zr 7 Ni 10 for AB 2 M1; Zr 9 Ni 11 for AB 2 M0 and AB 2 M2 alloys) diminishing the amount of C14 phase from 95% to 35%.…”

Section: Methodsmentioning

confidence: 98%

“…Further details of electrode preparation were described elsewhere. 15 Electrochemical measurements were run in a conventional cell placing the working electrode (metal hydride electrode), counter electrode (nickel mesh) and reference electrode (Hg/HgO electrodes) in the same compartment. All potentials are referred to the Hg/HgO reference electrode and experiments were carried out at room temperature.…”

Section: Methodsmentioning

confidence: 99%

“…13 We have demonstrated that the substitution of manganese and chromium by molybdenum has beneficial effects on many properties of AB 5 14 and AB 2 alloys, respectively. 15 Laves phases, i.e. the main AB 2 constituents, are intermetallic compounds that can be used as interstitial hydrogen storage materials or for Ni-MH anodes.…”

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confidence: 99%

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Electrochemical Determination of Physicochemical and Mechanical Properties in ZrCr_1-xNiMo_xHydrides

Zinola

Díaz

Téliz

2016

J. Electrochem. Soc.

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The formation and decomposition of ZrCr1-xNiMox (x = 0.0, 0.3, 0.6) hydrides were studied in strong alkaline solutions by charge/discharge curves and electrode potential-composition-temperature plots. Dimensionless hysteresis was obtained and related to physicochemical and mechanical magnitudes; yield strengths and hydrogen partial molar volumes. The lowest yield strength (0.88 × 107 N cm−2) was observed for ZrCr0.7NiMo0.3, which favors hydrogen embrittlement and the increase in the active area. Besides, yield strengths for ZrCr0.4NiMo0.6 are similar to those in the absence of molybdenum. On the other hand, ZrCr0.7NiMo0.3 exhibits similar hydrogen partial molar volumes as in the absence of molybdenum, ca. 33.7 and 34.4 cm3, respectively. The further rise in molybdenum molar proportions produces an increase in this magnitude, i.e. 48.1 cm3, due to the different packing density produced by the higher molybdenum atomic radius. Mechanical and electric works are also useful parameters for a hydride design. Therefore, from galvanostatic and zero current chronopotentiometric curves, maximum and lost works were evaluated showing that ZrCr0.7NiMo0.3 offer the largest benefits for storage purposes. From combining electrochemical free energies and discharge currents during the time operating process, the dissipative uncompensated heat was also calculated, showing again that ZrCr0.7NiMo0.3 is the appropriate for hydride applications.

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Section: Methodsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

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Electrochemical Determination of Physicochemical and Mechanical Properties in ZrCr_1-xNiMo_xHydrides

Zinola

Díaz

Téliz

2016

J. Electrochem. Soc.

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“…Metal hydrides have several advantages, including good reversibility and high hydrogen storage capacity, which have attracted extensive attention [8]. Currently, several hydrogen storage alloys have been developed, including rare earth AB 5 type [9], magnesium A 2 B type, titanium AB type [10], laves phase AB 2 type [11,12], and v-system body-centered cubic solid solution type [13] alloys. Among these, magnesium A 2 B Mg 2 Ni hydrogen storage alloy is considered one of the most attractive hydrogen storage materials as it is characterized by high hydrogen storage capacity and is cost-effective.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and hydrogen storage properties of Mg_1.8Y_0.2Ni_1−yCo_y (y = 0, 0.05, 0.1, 0.15, 0.2) alloys

Defa,

Huang,

Ren

et al. 2023

Mater. Res. Express

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The Mg1.8Y0.2Ni1−yCoy (y = 0, 0.05, 0.1, 0.15, 0.2) hydrogen storage alloys were prepared following the principles of metallurgy, the phase composition and microstructure of the alloys were studied using XRD and SEM/EDS techniques, and the hydrogen absorption and desorption properties of the alloys were studied using PCT and DSC techniques. The results showed that the addition of Co did not affect the phase composition of Mg1.8Y0.2Ni1−yCoy alloys in the as-cast state and after hydrogen absorption. The Co addition could help refine the microstructure of the alloys to a certain extent. The de-/hydrogenation kinetics of Mg1.8Y0.2Ni1−yCoy (y = 0, 0.1, and 0.2) alloys were improved by adding Co, and the best results were obtained at y = 0.1. The onset decomposition temperature of Mg1.8Y0.2Ni1−yCoy (y = 0, 0.1, and 0.2) alloys were recorded to be 180 °C, 156 °C, and 210 °C, respectively, which were significantly lower than that of Mg2Ni (253 °C). The results revealed that the addition Co could improve the thermodynamic performance of the dehydrogenation process.

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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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Molybdenum incorporation on AB2 alloys-part I metallurgical and electrochemical characterization: Electrocatalytic behavior

Cited by 9 publications

References 46 publications

Electrochemical Determination of Physicochemical and Mechanical Properties in ZrCr_1-xNiMo_xHydrides

Electrochemical Determination of Physicochemical and Mechanical Properties in ZrCr_1-xNiMo_xHydrides

Microstructure and hydrogen storage properties of Mg_1.8Y_0.2Ni_1−yCo_y (y = 0, 0.05, 0.1, 0.15, 0.2) alloys

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

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Molybdenum incorporation on AB2 alloys-part I metallurgical and electrochemical characterization: Electrocatalytic behavior

Cited by 9 publications

References 46 publications

Electrochemical Determination of Physicochemical and Mechanical Properties in ZrCr1-xNiMoxHydrides

Electrochemical Determination of Physicochemical and Mechanical Properties in ZrCr1-xNiMoxHydrides

Microstructure and hydrogen storage properties of Mg1.8Y0.2Ni1−yCoy (y = 0, 0.05, 0.1, 0.15, 0.2) alloys

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

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Electrochemical Determination of Physicochemical and Mechanical Properties in ZrCr_1-xNiMo_xHydrides

Electrochemical Determination of Physicochemical and Mechanical Properties in ZrCr_1-xNiMo_xHydrides

Microstructure and hydrogen storage properties of Mg_1.8Y_0.2Ni_1−yCo_y (y = 0, 0.05, 0.1, 0.15, 0.2) alloys