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

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外文摘要：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 stor-age 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％ .

外文关键词：

La-Mg-Ni-based alloysGas-phase hydrogen storage performanceCe2Ni7 phaseLaNi5 phaseCapacity retention rate

作者：

Guanjiu Wu、Yichao Xie、Yuan Li、Qing Wang、Chenfeng Fan、Wenfeng Wang、Lu Zhang、Shumin Han

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作者单位：

Hebei Key Laboratory of Applied Chemistry,Yanshan University,Qinhuangdao 066004,China

State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,China

基金：

National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaBasic Innovation Research Project in Yanshan UniversityChina Postdoctoral science FoundationPostdoctoral Research Project of Hebei ProvinceSubsidy for Hebei Key Laboratory of Applied Chemistry after Operation PerformanceSpecial Project for Local Science and Technology Development Guided by the Central Government of China

项目编号：

2022YFB380380051971197520712812022LGZD0042023M742945B202300302322567616H236Z1406G

出版年：

2024

DOI：

10.1007/s40195-024-01709-w

金属学报(英文版)

中国金属学会

金属学报(英文版)

CSTPCD

影响因子：0.77

ISSN：1006-7191

年,卷(期)：2024.37(8)