Effects of Ti-based catalysts on hydrogen desorption kinetics of nanostructured magnesium hydride |
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| Affiliation: | 1. Department of Materials Science and Engineering, Sharif University of Technology, 14588 Tehran, Iran;2. Institute for Nanoscience and Nanotechnology, Sharif University of Technology, 14588 Tehran, Iran;3. Department of Engineering, Shahid Beheshti University, 1983963113 Tehran, Iran;4. Department of Physics, University of Isfahan, 81744 Isfahan, Iran;5. Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran;1. Materials, Mechanics and Structures Research Division, Faculty of Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, UK;2. Energy and Sustainability Research Division, Faculty of Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, UK;1. Department of Metallurgical Engineering, University of Utah, 135 South 1460 East, Room 412, Salt Lake City, UT 84112-0114, USA;2. Chemical Science and Engineering Division, Argonne National Laboratory, 9700 South, Cass Avenue, Lemont, IL 60439, USA;3. Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA |
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| Abstract: | In the present work, the synergetic effect of Ti-based catalysts (TiH2 and TiO2 particles) on hydrogen desorption kinetics of nanostructured magnesium hydride was investigated. Nanostructured 84 mol% MgH2–10%mol TiH2–6%mol TiO2 nanocomposite powder was prepared by high-energy ball milling and subjected to thermal analyses. Evaluation of the absorption/desorption properties revealed that the addition of the Ti-based catalysts significantly improved the hydrogen storage performance of MgH2. A decrease in the decomposition temperature (as high as 100 °C) was attained after co-milling of MgH2 with the Ti-based catalysts. Meanwhile, solid-state chemical reactions between MgH2 and TiO2 nanoparticles during co-milling slightly decreased the maximum hydrogen capacity. It was also found that formation of micro-cracks at the particle surfaces during thermal cycling enhanced the H-kinetics. Isothermal and non-isothermal thermal analysis revealed that the addition of Ti-catalysts reduced the decomposition activation energy of MgH2 by 20–30 kJ/mol. |
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| Keywords: | Magnesium hydride Cyclic desorption Kinetics Nanostructure |
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