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Pellets of MgH2-based composites as practical material for solid state hydrogen storage |
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| Authors: | Ashish Khandelwal Filippo Agresti Giovanni Capurso Sergio Lo Russo Amedeo Maddalena Stefano Gialanella Giovanni Principi |
| Affiliation: | 1. Dipartimento di Ingegneria Meccanica, Settore Materiali, Università di Padova, via Marzolo 9, 35131 Padova, Italy;2. Dipartimento di Fisica and CNISM, Università di Padova, via Marzolo 8, 35131 Padova, Italy;3. Dipartimento di Ingegneria dei Materiali e Tecnologie Industriali, Università di Trento, via Mesiano 77, 38050 Mesiano, Trento, Italy |
| Abstract: | Hydrogenation properties and mechanical stability of pellets made starting from compressed ball-milled MgH2 powders mixed with catalysts (Nb2O5 and graphite) and a binding agent (aluminium powder) have been investigated. Structural characterization with X-ray diffraction and gas–solid reaction kinetic and thermodynamic tests with a Sievert's apparatus have been done on the samples up to 50 hydrogen absorption/desorption (a/d) cycles. The best cycling behaviour and mechanical strength stability have been observed for pellets of catalysed MgH2 powders added with 5 wt% aluminium annealed in vacuum at 450 °C before starting the a/d cycles. This mechanical stability to cycles has been attributed to the formation of a solid solution of aluminium in magnesium. |
| Keywords: | Hydrogen storage Magnesium hydride Pellets Mechanical strength Cycling stability |
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