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TemperaturedependenceofthedissociationpressureofMgH2Timelinereflectingthedevelopmentofhigh-capacityhydrogenstoragematerialsandassociatedstrategiestomeetpracticaltargets.Investigationsintohigh-capacityinorganiccompoundsonlytookoff20yearsago,followingthebreakthroughinreversibilitywithTi-dopedNaAlH4Schematicillustrationofa)physisorbed,b)chemisorbed,andc)weaklybondedhydrogenPropertiesofrepresentativematerialsforhydrogendistribution,on-sitegenerationandon-boardstorageTable1–VolumetricandgravimetricHydrogencontentinvariousmaterialsSchematicmodelofametalstructurewithHatomsintheintersticesbetweenthemetalatoms,andH2moleculesatthesurface.Hydrogenatomsarefromphysisorbedhydrogenmoleculesontheleft-handsideandfromthedissociationofwatermoleculesontheright-handside.镁密排六方晶格