Hexagonal-disk-shaped magnesium nanocrystals (Mg NCs) are fabricated within a porous metal–organic framework (MOF, see picture). The Mg NCs@MOF stores hydrogen by both physi- and chemisorptions, exhibiting synergistic effects to decrease the isosteric heat of H2 physisorption compared with that of pristine MOF, and decrease the H2 chemisorption/desorption temperatures by 200 K compared with those of bare Mg powder.
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