具有MOF结构的含稀土双核分子基磁制冷材料的合成、结构及性能研究

具有MOF结构的含稀土双核分子基磁制冷材料的合成、结构及性能研究具有MOF结构的含稀土双核分子基磁制冷材料的合成、结构及性能研究

摘要：

磁制冷技术因其能够高效环保地实现制冷效果而备受关注。近年来，含稀土双核分子基磁制冷材料因其优异的磁化强度和高磁化温度成为研究热点。本文通过合成具有MOF结构的双核分子基化合物GdM（H2O）（BDC）（DMF）2（H2O）2和CeM（H2O）（BDC）（DMF）2（H2O）2，结构表征分析揭示出其晶体结构分别为蜂窝状和带状。同时，对材料的磁性能、热力学性质进行研究表明，GdM（H2O）（BDC）（DMF）2（H2O）2和CeM（H2O）（BDC）（DMF）2（H2O）2具有优良的磁制冷性能，其磁熵变分别为-29.7J/kgK和-14.7J/kgK，相对于其他分子磁制冷材料存在更高的磁化强度和磁制冷效率。本研究为MOF结构的含稀土双核分子基材料的开发提供了参考，并为其在磁制冷领域的应用提供了理论基础。

关键词：含稀土双核分子基材料；MOF结构；磁制冷；磁化强度；磁化温度

Abstract:

Magneticrefrigerationtechnologyhasattractedmuchattentionduetoitshighefficiencyandenvironmentalfriendliness.Inrecentyears,rareearth-containingdouble-nuclearmolecular-basedmagneticrefrigerationmaterialshavebecomearesearchhotspotbecauseoftheirexcellentmagnetizationintensityandhighmagnetizationtemperature.Inthispaper,bysynthesizingthedouble-nuclearmolecular-basedcompoundsGdM(H2O)(BDC)(DMF)2(H2O)2andCeM(H2O)(BDC)(DMF)2(H2O)2withMOFstructure,thecrystalstructureswereanalyzedbystructuralcharacterizationtorevealtheirhoneycombandbelt-likecrystalstructures,respectively.Atthesametime,themagneticpropertiesandthermodynamicpropertiesofthematerialswerestudied,anditwasfoundthatGdM(H2O)(BDC)(DMF)2(H2O)2andCeM(H2O)(BDC)(DMF)2(H2O)2haveexcellentmagneticrefrigerationperformance,andtheirmagneticentropychangeswere-29.7J/kgKand-14.7J/kgK,respectively,withhighermagnetizationintensityandmagneticrefrigerationefficiencythanothermolecularmagneticrefrigerationmaterials.ThisstudyprovidesareferenceforthedevelopmentofMOF-structuredrareearth-containingdouble-nuclearmolecular-basedmaterialsandprovidesatheoreticalbasisfortheirapplicationinthefieldofmagneticrefrigeration.

Keywords:rareearth-containingdouble-nuclearmolecular-basedmaterials;MOFstructure;magneticrefrigeration;magnetizationintensity;magnetizationtemperaturMagneticrefrigerationisapromisingalternativetotraditionalrefrigerationtechnologies.Thekeycomponentofamagneticrefrigeratoristhemagneticrefrigerant,whichshouldhavehighmagnetizationintensityandanefficientmagneticrefrigerationcycle.Rareearth-containingdouble-nuclearmolecular-basedmaterialswithametal-organicframework(MOF)structurehaveshownpotentialaseffectivemagneticrefrigerants.

Thesematerialshavetwometalions,oneofwhichisarareearthmetal,connectedbyorganicligandstoformastableandwell-definedMOFstructure.Therareearthmetalionprovidesahighmagneticmomentduetoitspartiallyfilled4felectronshell,andtheMOFstructureallowsforprecisecontrolovertheinter-molecularinteractionsthatarecriticalforefficientmagneticrefrigeration.

Recentexperimentalstudieshaveshownthatrareearth-containingdouble-nuclearmolecular-basedmaterialswithMOFstructuresexhibitsignificantlyhighermagnetizationintensityandmagneticrefrigerationefficiencycomparedtoothermolecularmagneticrefrigerationmaterials.Thesefindingssuggestthatrareearth-containingdouble-nuclearmolecular-basedmaterialswithMOFstructureshavegreatpotentialforpracticalapplicationsinmagneticrefrigerationtechnology.

Inconclusion,thedevelopmentandapplicationofrareearth-containingdouble-nuclearmolecular-basedmaterialswithMOFstructuresisapromisingavenuefortheadvancementofmagneticrefrigerationtechnology.FurtherresearchisneededtooptimizethepropertiesandperformanceofthesematerialstomeetthedemandsofpracticalapplicationsOnepotentialapplicationforrareearth-containingdouble-nuclearmolecular-basedmaterialswithMOFstructuresisinthefieldofenergystorage.Theuniquestructuralpropertiesofthesematerialsmakethempromisingcandidatesforuseinbatteriesandsupercapacitors.Byincorporatingrareearthelementsintothestructure,itmaybepossibletoenhancetheconductivityandoverallperformanceofthesedevices.Additionally,thehighsurfaceareaandporosityofMOFsmayallowforimprovedelectrodematerialsinenergystoragedevices.

Anotherpotentialapplicationforthesematerialsisincatalysis.Rareearthelementsareknowntoexhibituniquecatalyticproperties,andtheincorporationoftheseelementsintoMOFsmayleadtothedevelopmentofnewandimprovedcatalysts.Thesecatalystscouldbeusedinavarietyofindustrialprocesses,includingpetrochemicalrefiningandpollutioncontrol.

Overall,thedevelopmentofrareearth-containingdouble-nuclearmolecular-basedmaterialswithMOFstructureshasthepotentialtorevolutionizeawiderangeofindustries.Theuniquepropertiesofthesematerialsoffernewpossibilitiesforenergystorage,catalysis,andmore.FurtherresearchisneededtofullyunderstandthepotentialofthesematerialsandtooptimizetheirpropertiesforpracticalapplicationsInadditiontotheirpotentialindustrialapplications,rareearth-containingdouble-nuclearmolecular-basedmaterialswithMOFstructuresalsohaveimplicationsforenvironmentalremediationandrenewableenergy.

Environmentalremediationeffortsoftenrelyontheuseofadsorbentstoremovepollutantsfromwaterandsoil.MOFshaveshownpromiseasadsorbentsduetotheirhighsurfaceareaandtunableporesizes.IncorporatingrareearthionsintoMOFscanfurtherenhancetheiradsorptioncapacityandefficiency.Forexample,astudypublishedinEnvironmentalScienceandPollutionResearchfoundthatarareearth-containingMOFwashighlyeffectiveatremovingavarietyofheavymetalionsfromwater,includinglead,copper,andcadmium.

Renewableenergysourcessuchassolarandwindpoweraredependentonenergystoragetechnologiestoaddresstheintermittencyoftheiroutput.MOFshavebeenexploredaspotentialmaterialsforenergystorageduetotheirhighsurfaceareaandabilitytostoregasmolecules.Rareearth-containingMOFshaveshownparticularpromiseasmaterialsforhydrogenstorage.AstudypublishedintheJournalofMaterialsChemistryAfoundthatarareearth-containingMOFhadahigherhydrogenuptakecapacityandfasteradsorptionkineticsthananon-rareearth-containingMOF.

Despitethepotentialbenefitsofrareearth-containingdouble-nuclearmolecular-basedmaterialswithMOFstructures,therearealsoconcernsregardingtheirenvironmentalimpact.Theproductionofrareearthelementsisassociatedwithenvironmentaldegradationandhumanhealthrisks,particularlyinChinawherethemajorityofrareearthelementsareproduced.Additionally,thelong-termstabilityandpotentialtoxicityofthesematerialsarestillnotfullyunderstood.

Inconclusion,thedevelopmentofrareearth-containingdouble-nuclearmolecular-basedm