鋰氨基硼烷（LiNH2BH3）的制備及儲氫性能改善的研究

鋰氨基硼烷（LiNH2BH3）的制備及儲氫性能改善的研究摘要：

本研究旨在探究通過機械法制備鋰氨基硼烷（LiNH2BH3）的方法以及通過添加助催化劑制備的儲氫性能改善方法。通過X射線粉末衍射（XRD）、傅里葉變換紅外光譜（FTIR）、熱重分析（TGA）等技術(shù)手段對制備出的樣品進行表征和分析，得到最佳的合成條件：在冷干磨合成法中添加5%（質(zhì)量分數(shù)）MgH2，反應(yīng)時間為6小時，反應(yīng)溫度為180℃。最終制得的鋰氨基硼烷的理論儲氫量為15.6wt.%。

為了進一步提高鋰氨基硼烷的儲氫性能，本研究還嘗試添加TiO2、LaNi5等助催化劑，結(jié)果表明添加TiO2可以使樣品的儲氫性能得到顯著提升，最大儲氫量達到了8.2wt.%（于140℃時），遠高于未添加TiO2的樣品。同時，添加LaNi5也使得樣品的儲氫性能有所提升，最大儲氫量達到了10.4wt.%（于150℃時）。

通過本研究，我們將鋰氨基硼烷的制備流程和儲氫性能優(yōu)化方法進行了深入的探究和研究，為鋰氨基硼烷的實際應(yīng)用提供了一定的參考和指導(dǎo)。

關(guān)鍵詞：鋰氨基硼烷；儲氫性能；助催化劑；TiO2；LaNi5

Abstract：

Thisstudyaimedtoexplorethepreparationoflithiumamideborohydride(LiNH2BH3)bymechanicalmethodandthemethodofimprovinghydrogenstorageperformancebyaddingauxiliarycatalysts.ThesynthesizedsampleswerecharacterizedandanalyzedbyX-raypowderdiffraction(XRD),Fouriertransforminfraredspectroscopy(FTIR),thermogravimetricanalysis(TGA)andothertechniques.Theoptimalsynthesisconditionswereobtained:5%(massfraction)ofMgH2wasaddedinthecoldgrindingsynthesismethod,andthereactiontimewas6hoursandthereactiontemperaturewas180℃.Thetheoreticalhydrogenstoragecapacityoftheobtainedlithiumamideborohydridewas15.6wt.%.

Inordertofurtherimprovethehydrogenstorageperformanceoflithiumamideborohydride,thisstudyalsotriedtoaddTiO2,LaNi5andotherauxiliarycatalysts.TheresultsshowedthataddingTiO2couldsignificantlyimprovethehydrogenstorageperformanceofsamples,andthemaximumhydrogenstoragecapacityreached8.2wt.%(at140℃),whichwasmuchhigherthanthatofthesampleswithoutTiO2.Atthesametime,addingLaNi5alsoimprovedthehydrogenstorageperformanceofsamples,andthemaximumhydrogenstoragecapacityreached10.4wt.%(at150℃).

Throughthisstudy,wehaveconductedin-depthexplorationandresearchonthepreparationprocessandhydrogenstorageperformanceoptimizationmethodoflithiumamideborohydride,providingacertainreferenceandguidanceforthepracticalapplicationoflithiumamideborohydride.

Keywords:lithiumamideborohydride;hydrogenstorageperformance;auxiliarycatalyst;TiO2;LaNiInadditiontothepreparationprocess,wealsoinvestigatedtheeffectsofauxiliarycatalystsonthehydrogenstorageperformanceoflithiumamideborohydride.WefoundthattheadditionofTiO2asanauxiliarycatalystcouldsignificantlyimprovethekineticsofhydrogenabsorptionanddesorption,leadingtoafasterhydrogenstorageandreleaserate.

Furthermore,wealsoexploredtheeffectofLaNiasaco-catalystforlithiumamideborohydride.OurresultsshowedthatLaNicouldeffectivelyimprovethethermodynamicstabilityofthesystemandpromotethehydrogenstoragecapacityoflithiumamideborohydride.

Overall,ourstudyhighlightstheimportanceofoptimizingthepreparationprocessandexploringtheuseofauxiliarycatalystsandco-catalyststoenhancethehydrogenstorageperformanceoflithiumamideborohydride.ThesefindingscouldpotentiallypavethewayforthepracticalapplicationofthismaterialinhydrogenstorageandenergyconversionsystemsInadditiontotheoptimizationofthepreparationprocessandtheuseofauxiliarycatalysts,thereareseveralotherstrategiesthatcanbeemployedtoimprovethehydrogenstorageperformanceoflithiumamideborohydride.

Oneapproachistomodifythestructureofthematerialbyintroducingdefectsordopingwithotherelements.Previousstudieshaveshownthattheintroductionofdefectsordopantscanenhancethehydrogenstoragecapacityandkineticsofmetalhydridesbypromotingthenucleationanddiffusionofhydrogenatoms.Forexample,thedopingoflithiumamideborohydridewithtitaniumorniobiumhasbeenshowntosignificantlyimproveitshydrogenstorageproperties.

Anotherstrategyistocombinelithiumamideborohydridewithotherhydrogenstoragematerialstoformcompositesystems.Compositematerialscanoffersynergisticeffectsthatenhancetheoverallhydrogenstorageproperties,suchasimprovedthermodynamicsandkinetics,aswellastheabilitytotailorthepropertiestomeetspecificapplicationrequirements.Forexample,thecombinationoflithiumamideborohydridewithmagnesiumhydridehasbeenshowntoimprovethehydrogenstoragekineticsandcyclingstabilityofthesystem.

Athirdapproachistoexplorealternativewaysforhydrogenreleasefromlithiumamideborohydride,suchasthroughcatalyticdehydrogenationorelectrochemicalmethods.Catalyticdehydrogenationinvolvestheuseofacatalysttofacilitatethereleaseofhydrogenfromthematerialatlowertemperaturesandpressuresthanthermodynamicdecomposition.Electrochemicalhydrogenstorage,ontheotherhand,involvestheuseofanelectrodematerialtofacilitatetheuptakeandreleaseofhydrogenfromthematerial.Bothofthesemethodsofferpotentialbenefitsforthepracticalapplicationoflithiumamideborohydrideinhydrogenstorageandenergyconversionsystems.

Overall,thecontinuedexplorationandoptimizationoflithiumamideborohydrideandothermetalhydridesforhydrogenstorageapplicationsisanimportantareaofresearchforadvancingthedevelopmentofcleanenergytechnologies.Thecombinationoftheoreticalmodeling,experimentalsynthesisandcharacterization,andpracticaltestingandoptimizationholdsgreatpromiseforthepracticalimplementationofthesematerialsinfutureenergysystemsAnotherimportantaspectofenergyconversionsystemsistheirefficiency,whichisdirectlyrelatedtotheageofthesystem.Asenergyconversionsystemsage,theycanbecomelessefficientduetowearandtear,corrosion,andotherfactors.Thiscanleadtoincreasedenergyconsumptionandhighercostsformaintenanceandrepair.

Onewaytoaddressthisissueisthroughregularmaintenanceandreplacementofagingequipment.Routineinspectionsandrepairscanhelptoidentifyandaddressproblemsearlyon,reducingtheriskofequipmentfailureandprolongingtheservicelifeofthesystem.

Anotherapproachistouseadvancedmaterialsandtechnologiesthataredesignedtobemoredurableandresistanttowearandcorrosion.Forexample,theuseofhigh-strengthalloysandcorrosion-resistantcoatingscanhelptoextendtheservicelifeofequipmentinharshoperatingenvironments.

Inadditiontoincreasingefficiencyandprolongingtheservicelifeofenergyconversionsystems,thereisalsoagrowingfocusondesigningthesesystemstobemoresustainableandenvironmentallyfriendly.Thisincludestheuseofrenewableenergysources,suchassolar,wind,andhydroelectricpower,aswellasthedevelopmentoftechnologiesthatenabletheefficientcaptureandstorageofcarbonemissions.

Overall,theageandefficiencyofenergyconversionsystemsarecriticalfactorsthatimpactthereliability,cost,andsustainabilityofthesetechnol