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 performance were investigated. X-ray diffraction (XRD) patterns and Rietveld refinement results showed that increased Mg transformed the LaNi5 phase in the La0.74Sm0.03Y0.23Ni4.32Al0.04 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 absorption/desorption cycles. An A2B7-type La0.57Sm0.02Y0.18Mg0.23Ni3.38Al0.03 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.
Graphical abstract
摘要
本文采用镁热扩散法成功实现了La–Mg–Ni系合金中的镁含量控制, 研究了镁热扩散过程中A2B7相的生成机制及镁含量对储氢性能的影响机制。X射线衍射图谱与全谱拟合结果显示, Mg热扩散过程中La0.74Sm0.03Y0.23Ni4.32Al0.04前驱物中的LaNi5相转变为超晶格结构, 扫描电子显微镜结果表明扩散至合金本体中的镁元素分布均匀。Mg进入到超晶格结构中有效抑制了吸放氢过程中超晶格结构的分解。通过镁热扩散法制备的La0.57Sm0.02Y0.18Mg0.23Ni3.38Al0.03合金由Gd2Co7相和Ce2Ni7相组成。压力-组成等温曲线测试结果显示合金储氢容量达到1.73wt%, 并且具有良好的循环稳定性。吸放氢循环50周后, 合金的储氢量仍可以达到1.45wt%, 容量保持率为84.28%。镁热扩散法为La–Mg–Ni 系合金的调控制备提供了一条有效途径。
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Acknowledgements
This work was financially supported by the National Key Research and Development Program of China (2022YFB3803804), the National Natural Science Foundation of China (Nos. 51971197, 52071281 and 52201282), Basic Innovation Research Project in Yanshan University (No. 2022LGZD004), China Postdoctoral Science Foundation (2023M742945), Postdoctoral research project of Hebei Province (B2023003023) and Subsidy for Hebei Key Laboratory of Applied Chemistry after Operation Performance (No. 22567616H).
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Zhang, YX., Wu, GJ., Gu, J. et al. A2B7-type La–Mg–Ni alloys prepared by Mg thermal diffusion for improved hydrogen storage performance. Rare Met. (2024). https://doi.org/10.1007/s12598-024-02627-7
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DOI: https://doi.org/10.1007/s12598-024-02627-7