Modulating superlattice structure and cyclic stability of Ce2Ni7-type LaY2Ni10.5-based alloys by Mn, Al, and Zr substitutions

Zhao, Shiqian; Wang, Hui; Yang, Lichun; Liu, Jiangwen; Ouyang, Liuzhang; Zhu, Min

doi:10.1016/j.jpowsour.2022.231067

Cited by 20 publications

(3 citation statements)

References 56 publications

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“…The hydrogen absorption plateau pressure decreased from 0.67 MPa (x = 0) to 0.02 (x = 0.3), and the hydrogen desorption plateau pressure decreased from 0.39 MPa (x = 0) to 0.01 MPa (x = 0.3). This shows that Mn can effectively reduce the plateau pressure of the hydrogen absorption/desorption of La-Y-Ni system hydrogen storage alloys, which is consistent with the current research [15,41]. At the same time, with the rise of x, the hydrogen absorption/desorption plateau of the alloy becomes flatter and wider, indicating that the addition of Mn can effectively promote the hydrogen absorption and desorption properties of La-Y-Ni system alloys.…”

Section: Hydrogen Storage Characteristicssupporting

confidence: 89%

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Effect of Mn Element on the Structures and Properties of A2B7-Type La–Y–Ni-Based Hydrogen Storage Alloys

Deng

Luo

Zhou

et al. 2022

Metals

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The structures, hydrogen storage behaviors and electrochemical properties of Y0.75La0.25Ni3.5−xMnx (x = 0–0.3) alloys were analyzed by X-ray diffraction, Neutron powder diffraction, pressure–composition isotherms and electrochemical tests. All alloys have a multiphase structure. With the increase in Mn content, the Gd2Co7-type phase of the alloys gradually transforms into the Ce2Ni7-type phase; the Mn atom mainly occupies the Ni sites in the [AB5] subunit and the interface between the [AB5] and [A2B4] subunits; the V[A2B4]/V[AB5] continuously decreases from 1.045 (x = 0) to 1.019 (x = 0.3), which reduces the volume mismatch between [A2B4] and [AB5] subunits. The maximum hydrogen absorption of the series alloys increases first and then decreases, and the addition of Mn effectively promotes the hydrogen absorption/desorption performance of the alloys. The maximum discharge capacity of the alloy electrodes is closely related to their hydrogen storage capacity at 0.1 MPa and hydrogen absorption/desorption plateau pressure. The cyclic stability of all the Mn-containing alloy electrodes is improved clearly compared to that of Mn-free alloy electrodes, because the volume mismatch between the [AB5] and [A2B4] subunits of the alloys becomes smaller after the addition of Mn, which can improve the structural stability and reduce the corrosion of alloys during hydrogen absorption/desorption cycles. When the Mn content is between 0.1 and 0.15, the Ce2Ni7-type phase of the alloys has high abundance and the alloy electrodes exhibit excellent overall performance.

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Section: Hydrogen Storage Characteristicssupporting

confidence: 89%

“…However, the key element, Mg, in La-Mg-Ni system alloys is volatile at high temperatures. Therefore, it is not only difficult to control the composition but also has potential safety hazards during the preparation of La-Mg-Ni alloys [14,15].…”

Section: Introductionmentioning

confidence: 99%

Effect of Mn Element on the Structures and Properties of A2B7-Type La–Y–Ni-Based Hydrogen Storage Alloys

Deng

Luo

Zhou

et al. 2022

Metals

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“…Further, Belgacem et al [29] showed that LaY 2 Ni 9 only maintained 54% capacity after 100 cycles. Other studies showed that multi-substituted materials based on the A 2 B 7 -type in the La-Y-Ni system, show great improvements in performance, outperforming already commercialized AB 5 -type metal hydrides [12,[30][31][32].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Y Content on Structural and Sorption Properties of A2B7-Type Phase in the La–Y–Ni–Al–Mn System

et al. 2023

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Metal hydrides are an interesting group of chemical compounds, able to store hydrogen in a reversible, compact and safe manner. Among them, A2B7-type intermetallic alloys based on La-Mg-Ni have attracted particular attention due to their high electrochemical hydrogen storage capacity (∼400 mAh/g) and extended cycle life. However, the presence of Mg makes their synthesis via conventional metallurgical routes challenging. Replacing Mg with Y is a viable approach. Herein, we present a systematic study for a series of compounds with a nominal composition of La2-xYxNi6.50Mn0.33Al0.17, x = 0.33, 0.67, 1.00, 1.33, 1.67, focusing on the relationship between the material structural properties and hydrogen sorption performances. The results show that while the hydrogen-induced phase amorphization occurs in the Y-poor samples (x < 1.00) already during the first hydrogen absorption, a higher Y content helps to maintain the material crystallinity during the hydrogenation cycles and increases its H-storage capacity (1.37 wt.% for x = 1.00 vs. 1.60 wt.% for x = 1.67 at 50 °C). Thermal conductivity experiments on the studied compositions indicate the importance of thermal transfer between powder individual particles and/or a measuring instrument.

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Effect of catalysts La2O3/Carbon on the electrochemical and kinetic properties of AB5-type hydrogen storage alloy

Wang,

Yong,

Cui

et al. 2024

Fuel

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Modulating superlattice structure and cyclic stability of Ce2Ni7-type LaY2Ni10.5-based alloys by Mn, Al, and Zr substitutions

Cited by 20 publications

References 56 publications

Effect of Mn Element on the Structures and Properties of A2B7-Type La–Y–Ni-Based Hydrogen Storage Alloys

Effect of Mn Element on the Structures and Properties of A2B7-Type La–Y–Ni-Based Hydrogen Storage Alloys

The Effect of Y Content on Structural and Sorption Properties of A2B7-Type Phase in the La–Y–Ni–Al–Mn System

Effect of catalysts La2O3/Carbon on the electrochemical and kinetic properties of AB5-type hydrogen storage alloy

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