Magnesium borohydride, Mg(BH4)(2), is an interesting material for hydrogen storage due to its high hydrogen content (14.9 wt.% of H-2). Unfortunately, a temperature of at least 350 degrees C is needed for releasing its hydrogen and the rehydrogenation process is only feasible under harsh conditions (950 bar H-2 and 300 degrees C). In order to improve the performances of this compound, we analyze in this study the concomitant effects of nano-confinement into mesoporous carbons and addition of Ni-Pt catalysts. This study uses different characterization tools to determine the effects of both nano-confinement and catalysts onto the pathway of decomposition. Usually, bulk Mg(BH4)(2) decomposes in several steps passing through intermediate species for which activation energies are high. In this study, we show that the confinement and catalyst addition on Mg(BH4)(2) result in a single step of hydrogen release and an activation energy below that of the bulk material with a value of 178 +/- 14 kJ mol(-1) as determined by the Kissinger's method. Interestingly, the hydrogen release is fully completed, i.e. 8H atoms per Mg(BH4)(2) formula unit are released, in less than 2 h at 350 degrees C. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.