鎂基儲氫材料制備與床體服役工況動態(tài)熱導(dǎo)率研究

鎂基儲氫材料制備與床體服役工況動態(tài)熱導(dǎo)率研究鎂基儲氫材料制備與床體服役工況動態(tài)熱導(dǎo)率研究

摘要：

儲氫材料是清潔能源領(lǐng)域發(fā)展的重點(diǎn)之一，鎂基儲氫材料由于其高儲氫量、易獲取等優(yōu)勢，備受研究者的關(guān)注。本文研究了鎂基儲氫材料的制備過程、性質(zhì)以及在床體服役工況下的動態(tài)熱導(dǎo)率變化規(guī)律。通過球磨法制備出不同粒徑的鎂基儲氫材料，利用X射線衍射儀、掃描電鏡等儀器研究了其結(jié)構(gòu)、形貌等特性。實(shí)驗(yàn)結(jié)果表明，球磨時間對儲氫性能有重要影響，合適的球磨時間可以顯著提高材料的儲氫性能。在床體服役工作條件下，研究了材料的動態(tài)熱導(dǎo)率變化規(guī)律，發(fā)現(xiàn)材料的熱導(dǎo)率隨溫度上升而增大，隨儲氫量增大而減小。本文針對鎂基儲氫材料在床體服役中的實(shí)際應(yīng)用，提出了一些可行的措施，為推廣鎂基儲氫材料的應(yīng)用提供一定的理論基礎(chǔ)。

關(guān)鍵詞：鎂基儲氫材料；球磨法制備；動態(tài)熱導(dǎo)率；床體服役工況

Abstract:

Hydrogenstoragematerialisoneofthefocusesofcleanenergyfield,andmagnesium-basedhydrogenstoragematerialhasattractedmuchattentionduetoitshighhydrogenstoragecapacityandeasyaccess.Inthispaper,thepreparationprocessandpropertiesofmagnesium-basedhydrogenstoragematerialsandthedynamicthermalconductivitychangesundertheworkingconditionsofbedservicewerestudied.Magnesium-basedhydrogenstoragematerialswithdifferentparticlesizeswerepreparedbyballmilling.ThestructureandmorphologyofthematerialswerestudiedbyX-raydiffractionandscanningelectronmicroscopy.Theexperimentalresultsshowthattheballmillingtimehasanimportantinfluenceonthehydrogenstorageperformance,andappropriateballmillingtimecansignificantlyimprovethehydrogenstorageperformanceofthematerial.Undertheworkingconditionsofbedservice,thedynamicthermalconductivitychangeofthematerialswasstudied,anditwasfoundthatthethermalconductivityofthematerialsincreasedwiththetemperatureanddecreasedwiththeincreaseofhydrogenstoragecapacity.Inviewoftheactualapplicationofmagnesium-basedhydrogenstoragematerialsinbedservice,somefeasiblemeasureswereproposedinthispapertoprovideacertaintheoreticalbasisforthepromotionofmagnesium-basedhydrogenstoragematerials.

Keywords:magnesium-basedhydrogenstoragematerial;ballmillingpreparation;dynamicthermalconductivity;bedserviceconditionMagnesium-basedhydrogenstoragematerialshaveattractedmuchattentionduetotheirhighhydrogenstoragecapacityandlightweight.However,thepracticalapplicationofthesematerialsishinderedbytheirpoorthermalconductivityandstabilityunderbedserviceconditions.Inthisstudy,weinvestigatedthedynamicthermalconductivityofball-milledmagnesium-basedhydrogenstoragematerialsandtheirhydrogenstoragecapacityunderdifferentconditions.

Ourresultsshowedthatballmillingcaneffectivelypromotethehydrogenstoragecapacityofmagnesium-basedhydrogenstoragematerials.Thedynamicthermalconductivityofthematerialsalsoincreasedwiththetemperature,whichisbeneficialfortheheattransferinthebed.However,thehydrogenstoragecapacitydecreasedwiththeincreaseofhydrogenstoragecapacity,whichisattributedtotheformationofMgH2attheexpenseofMg.

Toaddressthestabilityissueofmagnesium-basedhydrogenstoragematerialsunderbedserviceconditions,severalmeasureswereproposed.Oneapproachistoaddasmallamountofstabilizingelements,suchasTiorZr,tothematerialtoimproveitsstability.Anotherwayistodesignasuitablecontainerforthematerialtopreventcontactwithairandmoisture.

Inconclusion,ourstudyprovidesatheoreticalbasisforthepromotionofmagnesium-basedhydrogenstoragematerialsinpracticalapplications.FutureresearchshouldfocusondevelopingnewpreparationmethodstoenhancethestabilityandthermalconductivityofthesematerialsunderdifferentconditionsPossiblecontinuation:

Additionally,itiscrucialtoconsiderthesafetyandusabilityaspectsofmagnesium-basedhydrogenstoragematerials.Forexample,thereactivityofmagnesiumwithwaterandacidsrequirescarefulhandlingandstorageofthematerials,especiallyiftheyareexposedtosuchsubstancesduringtheirlifetime.Moreover,thepropertiesofmagnesiumasametal,suchasitshighthermalconductivityandelectricalconductivity,canaffectthedesignandoperationofdevicesthatcontainmagnesium-basedmaterials.

Onepotentialapplicationareaformagnesium-basedhydrogenstoragematerialsisinportableandstationaryfuelcells.Fuelcellsconverthydrogengasintoelectricity,producingwaterandheatasbyproducts.However,tousehydrogeninfuelcells,itmustbestoredandtransportedsafelyandefficiently.Magnesium-basedmaterialsofferapromisingalternativetootherhydrogenstoragemethodsduetotheirhighcapacity,lowcost,andenvironmentalfriendliness.Moreover,theabilitytorechargeandreusemagnesium-basedmaterialscouldmakethemmorepracticalandeconomicallycompetitivethanotheroptions.

Anotherpossibleapplicationofmagnesium-basedhydrogenstoragematerialsisinthefieldofrenewableenergystorage.Theintermittentnatureofsolarandwindpowersourcescreateschallengesfortheirwidespreadadoption,asexcessenergymustbestoredforuseduringperiodsoflowgeneration.Hydrogenisaversatileandenergy-densecarrierthatcanstoreandreleaseenergyviavarioussystems,includingfuelcellsandcombustionengines.Magnesium-basedmaterialscouldplayaroleinenablingefficientandsustainablehydrogenstorageforrenewableenergyapplications.

However,beforemagnesium-basedhydrogenstoragematerialscanbewidelydeployed,moreresearchisneededtoaddressvarioustechnicalandpracticalissues.Forexample,thecompatibilityanddurabilityofmagnesium-basedmaterialswithothercomponents,suchascatalystsandcurrentcollectors,infuelcellsystemsneedtobeinvestigated.Additionally,theeffectsoftemperature,pressure,andcyclingontheperformanceandstabilityofmagnesium-basedmaterialsrequiredetailedcharacterizationandoptimization.Finally,thescalabilityandcost-effectivenessofmagnesium-basedmaterialsforpracticalapplicationsmustbeevaluatedandcomparedwithotherstorageoptions.

Insummary,thepotentialbenefitsofmagnesium-basedhydrogenstoragematerialsmakethemanattractiveoptionforadvancingthegoalofsustainableenergy.However,realizingtheirfullpotentialwillrequireinnovativeandcollaborativeeffortsfromresearchers,engineers,andpolicymakerstoovercometechnical,safety,andeconomichurdles.Withcontinuedinvestmentsandadvancements,magnesium-basedmaterialscouldhelpacceleratethetransitiontoacleanerandmoreefficientenergyfutureAnotherchallengethatmustbeovercomeinordertofullyutilizemagnesium-basedhydrogenstoragematerialsistheissueofscalability.Whilemanylaboratory-scaleexperimentshaveshownpromisingresultswithregardstotheabilityofmagnesium-basedmaterialstostorehydrogen,industrial-scaleproductionofthesematerialsremainsasignificantobstacle.Thisisbecausethecurrentprocessforproducingmagnesiumcanbeenergy-intensiveandoftenresultsintheemissionofcarbondioxide.Asaresult,theeconomicfeasibilityofusingmagnesium-basedmaterialsforhydrogenstorageonalargescaleremainsuncertain.

Toaddressthischallenge,researchersareexploringalternativemethodsforproducingmagnesiumthataremoresustainableandenergy-efficient.Forexample,someresearchersareinvestigatingtheuseofrenewablesourcesofenergy,suchassolarorwindpower,topowertheproductionofmagnesium.Othersareexploringtheuseofalternativesourcesofmagnesium,suchasseawaterorbrine,whichcouldpotentiallyreducethecarbonfootprintofmagnesiumproduction.

Inadditiontotechnicalandeconomicchallenges,theuseofhydrogenasafuelalsoraisesconcernsaboutsafety.Hydrogenisanextremelyflammablegasandcanbedifficulttostoreandtransportsafely.Magnesium-basedmaterialscanposeadditionalsafetyrisks,astheyarehighlyreactiveandcanignitespontaneouslywhenincontactwithairorwater.

Toaddressthesesafetyconcerns,researchersareexploringwaystomitigatetherisksassociatedwithhydrogenstorageandtransportation.Oneapproachinvolvesdevelopingnewhydrogenstoragematerialsthataremorestableandlessreactivethanmagnesium-basedmaterials.Anotherapproachinvolvesimplementingsafetymeasures,suchastheuseofsensorsandothermonitoringtechnologies,todetectandpreventunsafeconditions.

Finally,thewidespreadadoptionofmagnesium-basedhydrogenstoragematerialswillalsorequirethesupportofpolicymakersandregulators.Governmentsandinternationalorganizationscanplayakeyroleinincentivizingthedevelopmentanddeploymentofnewtechnologies,aswellasimplementingregulationsandstandardstoensurethesafetyandsustainabilityofhydrogenproduction,storage,andtransportation.

Inconclusion,magnesium-basedhydrogenstoragematerialsofferapromisingsolutionforadva