Effect of in-situ formed Mg2Ni/Mg2NiH4 compounds on hydrogen storage performance of MgH2 |
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| Affiliation: | 1. Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, PR China;2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, PR China;1. Center for Energy Materials Research, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea;2. Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea;3. Advanced Metals Division, Korea Institute of Materials Science, Changwon, 51508, Republic of Korea;4. Advanced Materials Engineering, University of Science and Technology, Daejeon, 34113, Republic of Korea;1. Institute for Advanced Materials Research, Hiroshima University, Higashi-Hiroshima, 739-8530, Japan;2. Materials Processing and Corrosion Engineering Division, BARC, Mumbai, 400 085, India;3. Graduate School of Advanced Science of Matter, Hiroshima University, Higashi-Hiroshima 739-8530, Japan;4. Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima 739-8521, Japan;1. State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, PR China;2. Guangdong Provincial Key Laboratory of Advance Energy Storage Materials, South China University of Technology, Guangzhou, 510640, China;3. Department of Chemistry and Biotechnology, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC, 3122, Australia;1. Key Laboratory of Lightweight and Reliability Technology for Engineering Vehicle, The Education Department of Hunan Province, Changsha University of Science and Technology, Changsha 410114, China;2. State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China;3. Key Laboratory of Efficient and Clean Energy Utilization, College of Hunan Province, Changsha University of Science and Technology, Changsha 410114, China;4. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China |
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| Abstract: | Magnesium-based hydrogen storage materials (MgH2) are promising hydrogen carrier due to the high gravimetric hydrogen density; however, the undesirable thermodynamic stability and slow kinetics restrict its utilization. In this work, we assist the de/hydrogenation of MgH2 via in situ formed additives from the conversion of an MgNi2 alloy upon de/hydrogenation. The MgH2–16.7 wt%MgNi2 composite was synthesized by ball milling of Mg powder and MgNi2 alloy followed by a hydrogen combustion synthesis method, where most of the Mg converted to MgH2, and the others reacted with the MgNi2 generating Mg2NiH4, which produced in situ Mg2Ni during dehydrogenation. Results showed that the Mg2Ni and Mg2NiH4 could induce hydrogen absorption and desorption of the MgH2, that it absorbed 2.5 wt% H2 at 473 K, much higher than that of pure Mg, and the dehydrogenation capacity increased by 2.6 wt% at 573 K. Besides, the initial dehydrogenation temperature of the composite under the promotion of Mg2NiH4 decreased greatly by 100 K, whereas it is 623 K for MgH2. Furthermore, benefiting from the catalyst effect of Mg2NiH4 during dehydrogenation, the apparent activation energy of the composite reduced to 73.2 kJ mol?1 H2 from 129.5 kJ mol?1 H2. |
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| Keywords: | Magnesium hydride Hydrogen storage kinetics |
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