Effect of rare earth hydrides on hydrogen absorption and desorption properties of CeMgNi hydrogen storage alloy

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy Pub Date : 2025-04-24 DOI:10.1016/j.ijhydene.2025.04.287

Zhu Jiaqi , Xu Jin , Li Ruihan , Yang Yifei , Bai Junyu , Hu Feng , Wang Li

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引用次数: 0

Abstract

This study focuses on the preparation of the CexMg_2-xNi hydrogen storage alloy (where x = 0, 0.2, 0.3, 0.4, 0.5) through the method of vacuum induction melting. The research examined the influence of varying Ce concentrations on the characteristics of the Mg₂Ni hydrogen storage alloy. The phase structure and microstructure of the synthesized alloys were characterized through X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The kinetic and thermodynamic characteristics of samples subjected to various environmental conditions were assessed using a PCT tester. Additionally, DSC curves for samples heated at rates of 5 K/min, 10 K/min, 15 K/min, and 20 K/min were obtained through TG. The results indicated that the CeMgNi₄ phase, which arises from the partial substitution of Mg with Ce, did not engage in the hydrogen absorption and desorption processes, leading to a reduction in hydrogen storage capacity to a certain extent. Nevertheless, The enhancement of the overall hydrogen storage performance of the CeMgNi hydrogen storage alloy was significantly correlated with the increased content of the CeMgNi₄ phase.

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稀土氢化物对CeMgNi贮氢合金吸氢和解吸氢性能的影响

研究了采用真空感应熔炼法制备CexMg2-xNi贮氢合金（x = 0,0.2, 0.3, 0.4, 0.5）。研究了不同浓度的Ce对Mg2Ni储氢合金性能的影响。通过x射线衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）对合成合金的相结构和显微组织进行了表征。使用PCT测试仪评估了各种环境条件下样品的动力学和热力学特性。另外，通过热重分析得到了5 K/min、10 K/min、15 K/min和20 K/min加热速率下样品的DSC曲线。结果表明，由于Mg被Ce部分取代而形成的CeMgNi4相没有参与吸氢和解吸过程，从而在一定程度上降低了储氢能力。然而，CeMgNi储氢合金整体储氢性能的增强与CeMgNi4相含量的增加显著相关。

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.