Hydrogen storage thermodynamic and dynamic properties of as-milled CeMgNi-based CeMg12-type alloys |
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| Affiliation: | 1. Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China;2. Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China;3. Department of Mechanical Engineering, Hebei University, Baoding 071002, China;1. Advanced Energy Materials Research Institute, North China Electric Power University, No.2 Beinonglu Changping District, Beijing 102206, China;2. China Iron & Steel Research Institute Group, Advanced Technology & Materials Co., Ltd, No.76 Xueyuan nanlu, Haidian District, Beijing 100081, China;1. School of Materials Science and Engineering, Shandong University, Ji’nan 250061, China;2. Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China;3. Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China;1. Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou, 014010, China;2. Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing, 100081, China;3. Weishan Cisri Rare Earth Materials Co. Ltd., Jining, 277600, Shandong, China |
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| Abstract: | Ni was chosen to partially substitute the Mg of alloys to investigate the effect on hydrogen storage dynamics of NdMg12-type alloy. The amorphous and nanocrystalline alloys were synthesized by mechanical milling technology based on CeMg11Ni + x wt% Ni (x = 100, 200) alloys. This paper systematically narrates and investigates the influences of Ni content and milling duration on hydrogen storage performance. Sievert apparatus and differential scanning calorimetry (DSC) were utilized for investigating the de-/hydriding performances of samples. Both Arrhenius and Kissinger methods were utilized in this paper for estimating the dehydrogenation activation energy of hydrides, and found that enhancing Ni content can decrease the thermodynamic parameters (ΔH and ΔS) of alloys slightly and improve the dehydriding dynamics significantly. Furthermore, the hydrogen storage property can be affected significantly by adjusting milling time. With varying milling time, the hydrogen storage capacities can reach the maximum values of 5.691 and 5.904 wt% for x = 100 and 200 alloys separately. The hydrogen absorption saturation ratio (Ra(10)) at 573 K and 3 MPa also obtains maximum values with the variation of milling time, namely 90.17% and 99.32% for x = 100 and 200 alloys separately. The hydrogen desorption ratio (Rd(20)) always increases with milling time increasing. To be specific, prolonging milling time from 5 to 60 h results in the increase of Rd(20) at 593 K from 37.55% to 47.21% for x = 100 alloy and 47.29%–61.70% for x = 200 alloy. |
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| Keywords: | Ball milling Hydrogen storage thermodynamics and dynamics Dehydrogenation activation energy |
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