Effect of Y, Al Co-Doping on Hydrogen Storage Properties of La–Mg–Ni-Based Alloys

IF 2.9 2区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Acta Metallurgica Sinica-English Letters Pub Date : 2024-05-31 DOI:10.1007/s40195-024-01709-w
Guanjiu Wu, Yichao Xie, Yuan Li, Qing Wang, Chenfeng Fan, Wenfeng Wang, Lu Zhang, Shumin Han
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Abstract

La–Mg–Ni-based hydrogen storage alloys have excellent hydrogen storage properties. This work reports the hydrogen storage performance of a series of A2B7-type La0.96Mg0.04Ni3.34Al0.13 alloy and La0.96-xYxMg0.04Ni3.47–0.6xAl0.6x (x = 0, 0.22, 0.33, 0.44) alloys, and explores the effect of Y and Al element combined substitution on the microstructure and hydrogen storage performance of A2B7-type La–Mg–Ni-based alloys. The alloys are composed of Ce2Ni7 phase and LaNi5 phase. With the increase of x, the cell volume of Ce2Ni7 phase decreases, while that of LaNi5 phase increases, indicating that Y atom mainly enters Ce2Ni7 phase and Al atom mainly enters LaNi5 phase. An appropriate amount of co-substitution increases the hydrogen storage capacity and reduces the hydrogen absorption/desorption plateau pressure hysteresis of the alloy. When x = 0.44, the hydrogen storage capacity of the alloy is 1.449 wt%, and the hysteresis coefficient is 0.302. The cell volume of Ce2Ni7 phase and LaNi5 phase expands to different degrees after 20 absorption/desorption cycles. With the increase of x, the volume expansion rate decreases, and the cycle capacity retention rate also gradually decreases. This is related to the amorphization of Ce2Ni7 phase. When x = 0.22, the capacity retention rate of the alloy is 91.4%.

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Y、Al 共掺对 La-Mg-Ni-Based 合金储氢性能的影响
La-Mg-Ni 基储氢合金具有优异的储氢性能。本研究报告了一系列 A2B7 型 La0.96Mg0.04Ni3.34Al0.13 合金和 La0.96-xYxMg0.04Ni3.47-0.6xAl0.6x (x = 0, 0.22, 0.33, 0.44) 合金的储氢性能,并探讨了 Y 和 Al 元素联合取代对 A2B7 型 La-Mg-Ni 基合金微观结构和储氢性能的影响。合金由 Ce2Ni7 相和 LaNi5 相组成。随着 x 的增加,Ce2Ni7 相的晶胞体积减小,而 LaNi5 相的晶胞体积增大,这表明 Y 原子主要进入 Ce2Ni7 相,而 Al 原子主要进入 LaNi5 相。适量的共取代增加了合金的储氢能力,降低了合金的吸氢/解吸高原压力滞后。当 x = 0.44 时,合金的储氢能力为 1.449 wt%,滞后系数为 0.302。经过 20 次吸收/解吸循环后,Ce2Ni7 相和 LaNi5 相的电池体积会有不同程度的膨胀。随着 x 的增加,体积膨胀率降低,循环容量保持率也逐渐降低。这与 Ce2Ni7 相的非晶化有关。当 x = 0.22 时,合金的容量保持率为 91.4%。
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来源期刊
Acta Metallurgica Sinica-English Letters
Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
6.60
自引率
14.30%
发文量
122
审稿时长
2 months
期刊介绍: This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.
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