锂氨基硼烷（LiNH2BH3）的制备及储氢性能改善的研究

锂氨基硼烷（LiNH2BH3）的制备及储氢性能改善的研究摘要：

本研究旨在探究通过机械法制备锂氨基硼烷（LiNH2BH3）的方法以及通过添加助催化剂制备的储氢性能改善方法。通过X射线粉末衍射（XRD）、傅里叶变换红外光谱（FTIR）、热重分析（TGA）等技术手段对制备出的样品进行表征和分析，得到最佳的合成条件：在冷干磨合成法中添加5%（质量分数）MgH2，反应时间为6小时，反应温度为180℃。最终制得的锂氨基硼烷的理论储氢量为15.6wt.%。

为了进一步提高锂氨基硼烷的储氢性能，本研究还尝试添加TiO2、LaNi5等助催化剂，结果表明添加TiO2可以使样品的储氢性能得到显著提升，最大储氢量达到了8.2wt.%（于140℃时），远高于未添加TiO2的样品。同时，添加LaNi5也使得样品的储氢性能有所提升，最大储氢量达到了10.4wt.%（于150℃时）。

通过本研究，我们将锂氨基硼烷的制备流程和储氢性能优化方法进行了深入的探究和研究，为锂氨基硼烷的实际应用提供了一定的参考和指导。

关键词：锂氨基硼烷；储氢性能；助催化剂；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