Structure and hydrogen storage properties of La1-xPrxMgNi3.6Co0.4 (x = 0–0.4) alloys prepared by melt spinning |
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| Affiliation: | 1. Department of Energy Systems, Institute for Energy Technology, Kjeller NO 2027, Norway;2. Department of Materials Science and Engineering, Norwegian University of Science and Technology, Trondheim NO 7491, Norway;1. Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing, 100081, China;2. Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou, 014010, China;3. Research Institute for Energy Equipment Materials, Hebei University of Technology, Tianjin, 300130, China;1. School of Materials Science and Engineering and Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, South China University of Technology, Guangzhou, 510641, China;2. Department of Physics, South China University of Technology, Guangzhou 510640, China;3. China-Australia Joint Laboratory for Energy & Environmental Materials, South China University of Technology, Guangzhou, 510641, China;1. Baotou Research Institute of Rare Earths, Baotou 014030, PR China;2. National Engineering Research Center of Rare Earth Metallurgy and Functional Materials, Baotou 014030, PR China;3. Tianjin Baogang Research Institute of Rare Earths Co., Ltd, Tianjin 300300, PR 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. Whole Win (Beijing) Materials Sci. & Tech. Co., Ltd., Beijing 100083, China |
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| Abstract: | Melt spinning technology was applied to prepared La1-xPrxMgNi3.6Co0.4 (x = 0–0.4) alloys, and phase composition, micro-structure, morphology and hydrogen storage properties were systematically investigated. The results show that the alloys contain two phases, LaMgNi4 and LaNi5 which have been detected by XRD and SEM. The grain of the alloys is refined by increasing Pr content and the phase abundance changed obviously. The hydrogen absorption capacity (wt%) of the alloys is 1.663, 1.659, 1.60, 1.593 and 1.566, corresponding the Pr substation of x from 0 to 0.4. The hydrogenation cycle stability indicates that the hydrogen capacity declined severely with the hydrogenation cycles. It is attributed to the hydrogen-induced amorphization which is confirmed by the XRD results after hydrogenation cycles. In order to recover the hydrogen storage capacity after cycles, the annealing treatment at 673 K for 3 h was carried out. And the XRD and HRTEM results show that the amorphization structure after hydrogen absorption/desorption cycles is re-crystallized by annealing treatment. |
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| Keywords: | Hydrogenation properties Hydrogen-induced amorphization Hydrogen absorption capacity recovery |
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