氧化物及金属包覆镁基超细粉制备与储氢性能研究

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1、上海交通大学硕士学位论文alloybulkto0.58wt%intheevaporatedMg-Ypowder,whiletheCecontentjustreduced5wt%intheMg-Cemixtureanodeto2.92wt%inthearcevaporatedMg-Cepowder.ComparedtheMg-CeoxidepowderwithMg-Y2O3powderonhydrogenabsorptionanddesorptionperformances,thehydrogena

2、bsorptionactivationenergyoftheMg-Ceoxide(47.75kJ/molH2)islowerthantheMg-Y2O3(79.9kJ/molH2).DTAcurvesshowthattheonsethydrogenreleasetemperaturewas658KforthehydrogenatedMg-Ceoxidepowder,whichislowerthanthat(676K)ofMg-Y2O3powder.TheseresultsrevealedthatC

3、e2O3hasbettercatalyticeffectonMg-basedhydrogenstoragematerialsthanY2O3.ThestudyofmetalcoatedpureMgultrafinepowdersshowthat:themetalsgeneratedfromtheelectrolessplatingcoveredonthesurfaceofMgparticlesandformedacore-shellstructure.TheMg@Nicompositehasexc

4、ellentperformanceonhydrogendesorptionproperties.DSCcurveofthehydrogenatedMg@Nishowsanonsethydrogenreleasetemperatureof616KandthelowestPCTrecyclingtemperatureis548K.Mg2NiplaysthecatalyticrolefortheMg@Nicomposite.FortheMg@Fepowder,theonsethydrogenreleas

5、etemperatureandhydrogenabsorbingactivationenergyare623Kand56.39kJ/molH2,respectively.AsMgFe2H6isnot foundinthehydrogenatedMg@Fesample,whichmeansFeshellisthe actualcatalyst.ThehydrogendesorptionabilitiesofMg@Tipowderare similartotheMg@Nipowder.TheDSCcu

6、rveofhydrogenatedMg@Ti showsanonsethydrogenreleasetemperatureof620KandthelowestPCT recyclingtemperatureis548K.TiandTiO2depositedonMgparticle surfacesimultaneouslyduringelectrolessplating,bothshowgoodcatalytic effectonthedehydrogenationperformanceofMgH

7、2.Keywords:DCarcplasma,Mg-basedhydrogenstoragematerials,electrolessplating,coatingIV万方数据上海交通大学硕士学位论文目录摘要.................................................................................................................................IABSTRACT.........

8、..........................................................................................................III第一章绪论....................................................................................................................11.1氢能源开发的意义及