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

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

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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.

La-Mg-Ni-based hydrogen storage alloyA2B7-type superlattice alloyMg thermal diffusion processPhase transformationHydrogen storage property

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

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Hebei Key Laboratory of Applied Chemistry,School of Environmental and Chemical Engineering,Yanshan University,Qinhuangdao 066004,China

Department of Chemistry and Biochemistry,San Diego State University,San Diego,CA 92182-1030,USA

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

National Key Research and Development Program of ChinaNational Natural Science Foundation 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 Performance

2022YFB38038045197119752071281522012822022LGZD0042023M742945B202300302322567616H

2024

10.1007/s12598-024-02627-7

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
年,卷(期)：2024.43(7)
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