Synergetic effect of reactive ball milling and cold pressing on enhancing the hydrogen storage behavior of nanocomposite MgH2/10 wt% TiMn2 binary system |
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| Affiliation: | 1. ICMPE/CNRS-UPEC UMR 7182, 2-8 rue Henri Dunant, 94320 Thiais, France;2. Dpto. Física de Materiales, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid, Spain;3. Department of Physics and Astronomy and CNISM, University of Bologna, Bologna, Italy;1. Univ. Grenoble Alpes, F-38000 Grenoble, France;2. CNRS, Inst NEEL, CRETA, F-38042 Grenoble, France;3. Perm State University, 15 Bukireva St., 614990 Perm, Russian Federation;4. CNRS, LEGI, F-38041 Grenoble, France;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. Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;2. The Parker H. Petit Institute for Bioengineering and Bioscience (IBB), 315 Ferst Dr, Atlanta, GA 30332, USA;1. Nanoengineering Research Group, Centre for Mechanical Technology and Automation (TEMA), Department of Mechanical Engineering, University of Aveiro, 3810-193 Aveiro, Portugal;2. International Iberian Nanotechnology Laboratory (INL), Av. Mestre Jose Veiga, 4715-330 Braga, Portugal |
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| Abstract: | Intermetallic TiMn2 compound was employed for improving the de/rehydrogenation kinetics behaviors of MgH2 powders. The metal hydride powders, obtained after 200 h of reactive ball milling was doped with 10 wt% TiMn2 powders and high-energy ball milled under pressurized hydrogen of 70 bar for 50 h. The cold-pressing technique was used to consolidate them into 36-green buttons with 12 mm in diameter. During consolidation, the hard TiMn2 spherical powders deeply embedded into MgH2 matrix to form homogeneous nanocomposite bulk material. The apparent activation energies of hydrogenation and dehydrogenation for the fabricated buttons were 19.3 kJ/mol and 82.9 kJ/mol, respectively. The present MgH2/10 wt% TiMn2 nanocomposite binary system possessed superior hydrogenation/dehydrogenation kinetics at 225 °C to absorb/desorb 5.1 wt% hydrogen at 10 bar/200 mbar H2 within 100 s and 400 s, respectively. This new system revealed good cyclability of achieving 414 cycles within 600 h continuously without degradations. For the present study, the consolidated buttons were used as solid-state hydrogen storage for feeding proton-exchange membrane fuel cell through a house made Ti-reactor at 250 °C. This nanocomposite system possessed good capability for providing the fuel cell with hydrogen flow at an average rate of 150 ml/min. The average current and voltage outputs were 3 A and 5.5 V, respectively. |
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| Keywords: | Hydrogen storage nanomaterials Intermetallic catalysts Bulk nanocomposites Thermal stability Kinetics Fuel cell applications |
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