Improvement of hydrogen storage properties of Mg by catalytic effect of Al-containing phases in Mg-Al-Ti-Zr-C powders |
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| Affiliation: | 1. Institute of Physics of Materials, AS CR, Zizkova 22, CZ-61662, Brno, Czech Republic;2. CEITEC-Institute of Physics of Materials, AS CR, Zizkova 22, CZ-61662, Brno, Czech Republic;1. Institute of Physics of Materials, AS CR, v.v.i., Zizkova 22, CZ-61662 Brno, Czech Republic;2. CEITEC – Institute of Physics of Materials, AS CR, Zizkova 22, CZ-61662 Brno, Czech Republic;3. BUT, FME, IMSE, Technická 2896/2, CZ-616 69 Brno, Czech Republic;1. Department of Materials Physics, Eötvös University, Budapest, H-1518, PO Box 32, Budapest, Hungary;2. Physics of Nanostructured Materials, Faculty of Physics, University of Vienna, A-1090 Vienna, Austria;3. Department of Physics and Astronomy, Alma Mater Studiorum, University of Bologna, 40127 Bologna, Italy;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 |
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| Abstract: | The hydrogen storage (HS) properties and structures of ball-milled (BM) Mg-Ti-Al-Zr-C powders prepared under various milling conditions were investigated. The additions Ti, Zr, Al and C improved HS performance of Mg-based materials. The beneficial effect can be explained by catalysis of particles rich in Al, Ti and Zr located on the surface of Mg grains. The particles provide effective pathways for the hydrogen diffusion from/into the re/forming MgH2. The morphological and microstructural characteristics were investigated by scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM) and by X-ray diffraction (XRD). The hydrogen sorption was measured by Sieverts method. The various preparation processes of powders resulted in two phases: Mg17Al12, Mg1.95Al0.05. It was found, that mainly these phases had a strong positive effect on HS properties of studied powders. Both phases increased desorption/absorption equilibrium pressure. Improvement of desorption kinetics of powder containing phase Mg17Al12 was more expressive than powders with of Mg1.95Al0.05. |
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| Keywords: | Hydrogen storage Mg-alloys Aluminum Ball milling |
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