A2B7-type La-Mg-Ni alloys prepared by Mg thermal diffusion for improved hydrogen storage performance

Yong-Xi Zhang ¹Guan-Jiu Wu ¹Jing Gu ²Hong-Xing Kang ²Yuan Li ¹Di Zhou ¹Wen-Feng Wang ¹Lu Zhang ¹Shu-Min Han³

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作者信息

1. Hebei Key Laboratory of Applied Chemistry,School of Environmental and Chemical Engineering,Yanshan University,Qinhuangdao 066004,China
2. Department of Chemistry and Biochemistry,San Diego State University,San Diego,CA 92182-1030,USA
3. Hebei Key Laboratory of Applied Chemistry,School of Environmental and Chemical Engineering,Yanshan University,Qinhuangdao 066004,China;State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,China
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Abstract

A novel approach based on thermal diffusion was used to achieve controllable Mg content in A2B7-type La-Mg-Ni-based alloys.The formation mechanism of the A2B7-type phase as a result of the thermal diffusion process and the effect of Mg content on hydrogen storage perfor-mance were investigated.X-ray diffraction(XRD)patterns and Rietveld refinement results showed that increased Mg transformed the LaNi5 phase in the La0.74Sm0.03Y0.23-Ni4.32Al0.04 precursor alloy into a superlattice structure.Scanning electron microscopy(SEM)images showed that Mg was evenly distributed in the alloy bulk.Mg in the superlattice significantly inhibited the phase decomposition of the superlattice structure during the hydrogen absorp-tion/desorption cycles.An A2B7-type La0.57S-m0.02Y0.18Mg0.23Ni3.38Al0.03 alloy composed of Gd2Co7 and Ce2Ni7 phases was successfully synthesized.The pressure-composition isotherm profiles showed that the alloy had a hydrogen storage capacity as high as 1.73 wt％,with good cycling stability.After 50 cycles of hydrogen absorption/desorption,the alloy retained a hydrogen storage capacity of 1.45 wt％,with a capacity retention rate of up to 84.28％.The Mg thermal diffusion process thus provides a new approach for the controlled preparation of La-Mg-Ni-based alloys.

Key words

La-Mg-Ni-based hydrogen storage alloy/A2B7-type superlattice alloy/Mg thermal diffusion process/Phase transformation/Hydrogen storage property

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基金项目

National Key Research and Development Program of China(2022YFB3803804)

National Natural Science Foundation of China(51971197)

National Natural Science Foundation of China(52071281)

National Natural Science Foundation of China(52201282)

Basic Innovation Research Project in Yanshan University(2022LGZD004)

China Postdoctoral Science Foundation(2023M742945)

Postdoctoral research project of Hebei Province(B2023003023)

Subsidy for Hebei Key Laboratory of Applied Chemistry after Operation Performance(22567616H)

出版年

2024

稀有金属(英文版)

中国有色金属学会

稀有金属(英文版)

CSTPCDEI

影响因子：0.801

ISSN：1001-0521

参考文献量2

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