hydrogen storage device Maurizio Verga*, Fabio Armanasco*, Cristina Guardamagna*, Carmen Valli* Filippo Agresti** , Sergio Lo Russo**, Amedeo Maddalena**, Giovanni Principi** International Journal of Hydrogen Energy- 17 Agosto 2008 Casa Editrice Elsevier * CESI RICERCA **UNIVERSITÀ DI PADOVA A research program addressed to evaluate the magnesiumhydride storage scaling up effects is being developed by CESI RICERCA, Milano, and the Hydrogen Group of Padova University. A storage device containing 500 g of magnesium hydride powder (manufactured by Venezia Tecnologie S.p.A. using high- energy ball milling) has been designed and tested in different operating conditions. A number of absorption and desorption cycles at different temperatures and pressures has been carried out in order to see if the results are comparable with laboratory data obtained on small amounts (fractions of grams) of powder samples. A sensible performance degradation that reduced the overall storage capacity of about 50% has been noticed after 20 cycles, presumably due to local powder heating, fragmentation and subsequent compaction. Further tests on a smaller tank equipped also with a porous baffle gave useful indications for the design of an improved large hydrogen reservoir.