Guanjiu Wu, Yichao Xie, Yuan Li, Qing Wang, Chenfeng Fan, Wenfeng Wang, Lu Zhang, Shumin Han
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引用次数: 0
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%.
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.