Improved hydrogen storage kinetics of Mg-based alloys by substituting La with Sm |
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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. Weishan Cisri Rare Earth Materials Co. Ltd., Jining, 277600, Shandong, China;1. Programa de Pós-graduação em Ciência e Engenharia de Materiais, Universidade Federal de São Carlos, Rod. Washington Luiz, km 235, SP-310, CEP 13565-905, São Carlos, SP, Brazil;2. Departamento de Engenharia de Materiais, Universidade Federal de São Carlos (UFSCar), Rod. Washington Luis, km 235, SP-310, CEP 13565-905, São Carlos, SP, Brazil;3. Departamento de Engenharia Metalúrgica e Materiais, Universidade Federal de Minas Gerais, Rua Espirito Santo, 35, CEP 30160-030, Belo Horizonte, MG, Brazil;4. Laboratório Nacional de Luz Síncrotron (LNLS), Centro Nacional de Pesquisa em Energia e Materiais (CNPEM), Rua Giuseppe Máximo Scolfaro, 10000, Campinas, SP, CP 6192, CEP 13083-970, Campinas, SP, Brazil;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;1. GRINM Group Co., Ltd., National Engineering Research Center of Nonferrous Metals Materials and Products for New Energy, 100088, China;2. GRIMAT Engineering Institute Co., Ltd., 101407, China;3. Institute for Advanced Materials and Technology, University of Science & Technology Beijing, 100083, China;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. 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-Eare Earth Materials Co., Ltd., Jining 277600, China;4. Department of Mechanical Engineering, Hebei University, Baoding 071002, China |
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| Abstract: | Element substitution is an effective strategy for improving Mg-based alloys in their hydrogenation/dehydrogenation property. Thereby, in this paper, Sm was selected to partially replace La in a La–Mg-based alloy for improving its hydriding and dehydriding performance. The alloys with the compositions of Mg80Ni10La10-xSmx (x = 0–4) were manufactured through vacuum induction melting. Their microstructures and phase compositions were measured by XRD, SEM and HRTEM. The isothermal hydrogen storage property was tested through an automatic Sieverts apparatus. Non-isothermal hydrogen desorption performance was measured through TGA and DSC. Arrhenius and Kissinger methods were adopted to calculate the dehydrogenation activation energy of alloys. The results reveal that all of the experimental alloys can reversibly absorb and release a large amount of H2 at appropriate temperatures. The substitution of Sm for La ameliorates the hydriding and dehydriding kinetics, but it results in an undesired reduction of hydrogen absorption and desorption capacities. Substituting La by Sm decreases the initial hydrogen release temperature of the hydride visibly. Furthermore, substituting Sm for La engenders the dehydrogenation activation energy decline clearly, which is considered as the main reason for the improved hydrogen desorption kinetics resulted from Sm replacing La. |
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| Keywords: | Mg-based alloy Substituting La with Sm Kinetics Hydrogen storage Activation energy |
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