51. Pellets of MgH2-based composites as practical material for solid state hydrogen storage
- Author
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Khandelwal, Ashish, Agresti, Filippo, Capurso, Giovanni, Lo Russo, Sergio, Maddalena, Amedeo, Gialanella, Stefano, and Principi, Giovanni
- Subjects
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HYDRIDES , *METALLIC composites , *SOLID state physics , *STABILITY (Mechanics) , *MECHANICAL properties of metals , *BALL mills , *HYDROGEN content of metals - Abstract
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. [Copyright &y& Elsevier]
- Published
- 2010
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