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新型储氢材料的中子衍射研究(英文).docx

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新型储氢材料的中子衍射研究(英文) Introduction Astheworldshiftstowardssustainableenergysources,hydrogenhasemergedasapromisingalternativetofossilfuels.Oneofthebiggestchallengesinutilizinghydrogenasafuelisitsstorage.Currentstoragemethodssuchascompressedhydrogengasandliquidhydrogensufferfromlowenergydensity,safetyconcerns,andhighcost.Therefore,thesearchforasuitablehydrogenstoragematerialisongoing.Inrecentyears,therehasbeensignificantprogressindevelopingnewmaterialsthatcaneffectivelystorehydrogen.Inthispaper,wediscusstheneutrondiffractionresearchonnewhydrogenstoragematerials. Background Hydrogenstoragematerialscanbebroadlycategorizedintothreegroups:physisorption-basedmaterials,chemisorption-basedmaterials,andcomplexhydrides.Physisorptioninvolvestheweakbondingofhydrogenmoleculesontothesurfaceofamaterial,whilechemisorptioninvolvestheformationofachemicalbondbetweenthehydrogenmoleculeandthematerial.Complexhydridesarematerialsthatcontainhydrogenwithintheircrystalstructure. Neutronscatteringisapowerfultechniqueforstudyingthecrystalstructureofmaterials.Neutronsarescatteredbytheatomicnucleiinthematerial,providinginformationabouttheatomicpositionsandbondinginthematerial.Neutrondiffractionisparticularlyusefulforstudyinghydrogenstoragematerialsasitcanprovideinsightsintothelocationanddynamicsofthehydrogenatomsinthematerial. NewHydrogenStorageMaterials Oneofthemostpromisingnewhydrogenstoragematerialsismetal-organicframeworks(MOFs).MOFsareporousmaterialsconsistingofmetalionsorclusterslinkedbyorganicligands.ThehighsurfaceareaandtunableporesizeofMOFsmakethemidealcandidatesforhydrogenstorage. NeutrondiffractionstudieshavedemonstratedthatMOFscaneffectivelyadsorbhydrogenmolecules.ThediffractionpatternsrevealthatthehydrogenmoleculesarelocatedwithintheporesoftheMOF,andareheldinplacebyweakvanderWaalsforces.Inaddition,neutronscatteringcanalsoprovideinformationaboutthedynamicsofthehydrogenmoleculesintheMOF.RecentstudieshaveshownthatthedynamicsofthehydrogenmoleculesarestronglyinfluencedbythesizeandshapeoftheMO