In-situ hydrogen-induced evolution and de-/hydrogenation behaviors of the Mg93Cu7-xYx alloys with equalized LPSO and eutectic structure |
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| Affiliation: | 1. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin, 150001, PR China;2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, PR China;1. School of Materials Science and Engineering, South China University of Technology, Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, Guangzhou 510641, People''s Republic of China;2. School of Marine Engineering, Jimei University, Xiamen 361021, People''s Republic of China;3. Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering (IAPME), University of Macau, Macau SAR, People''s Republic of China;1. School of Materials Science and Engineering and Fujian Provincial Key Laboratory of Functional Materials and Applications, Xiamen University of Technology, Xiamen 361024, China;2. School of Marine Engineering and Fujian Provincial Key Laboratory of Naval Architecture and Ocean Engineering, Jimei University, Xiamen 361021, China;3. Institute of Advanced Wear & Corrosion Resistance and Functional Materials, Jinan University, Guangzhou 510632, China;1. Institute of Physics of Materials AS CR, v.v.i., Zizkova 22, CZ-61662, Brno, EU, Czech Republic;2. CEITEC-Institute of Physics of Materials, AS CR, Zizkova 22, CZ-61662, Brno, EU, Czech Republic;3. CEITEC-Brno University of Technology, Purkynova 123, CZ-612 00, Brno, EU, Czech Republic;1. Research Institute for Energy Equipment Materials, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China;2. Tianjin Key Laboratory of Laminating Fabrication and Interface Control Technology for Advanced Materials, Hebei University of Technology, Tianjin 300130, China;3. Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 100081, China;1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, PR China;2. College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, PR China |
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| Abstract: | Nanosizing is efficient as the dual-tuning of thermodynamics and kinetics for Mg-based hydrogen storage materials. The in-situ synthesis of nanocomposites through hydrogen-induced decomposition from long-period stacking ordered phase is proved effective to achieve active nano-sized catalysts with uniform dispersion. In this study, the Mg93Cu7-xYx (x = 0.67, 1.33, and 2) alloys with equalized Mg–Mg2Cu eutectic and 14H long-period stacking ordered phase of Mg92Cu3.5Y4.5 are prepared. Its solidification path is determined as α-Mg, 14H–Mg2Cu pair and Mg–Mg2Cu eutectic. The increased Y/Cu atomic ratio lowers the first-cycle hydrogenation rate of the alloys due to the increased 14H–Mg2Cu structure and reduced Mg–Mg2Cu eutectic interfaces. After the hydrogen-induced decomposition of the long-period stacking ordered phase, MgCu2 and YH3 nanoparticles are in-situ formed, and the following activation process significantly accelerates. The YH3 nanoparticles partly decompose to YH2 at 300 °C in vacuum and Mg–Mg2Cu-YHx nanocomposites are in-situ formed. The nano-sized YH2 helps catalyze H2 dissociation and the YHx/Mg interfaces stimulate H diffusion and the nucleation of MgH2. Therefore, the Mg93Cu5Y2 composite shows the fastest absorption rates. However, due to the positive effect of YHx/Mg interfaces on H diffusion and the negative effect of YH3 nanophases on the hydride decomposition, the minimum activation energy of 115.43 kJ mol−1 is obtained for the desorption of the Mg93Cu5.67Y1.33 hydride. |
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| Keywords: | Hydrogen storage Mg–Cu–Y nanocomposites Long-period stacking ordered phase Dehydrogenation kinetics |
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