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时间:2020-03-26
《KH添加对Na-Al-H配位氢化物可逆放氢性能的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、物理化学学~(WuliHuaxueXuebao11804Acta.一Chim..2013,29(8),1804-l808August[Article]doi:10.3866/PKU.WHXB201306061www.whxb.pku.edu.cnKH添加对Na-AI.H配位氢化物可逆放氢性能的影响王顺葵’李志杰肖学章范修林’陈志文’李寿权’葛红卫’陈立新(。浙江大学材料科学与工程学系,浙江省电池新材料与应用技术研究重点实验室,杭州310027甘肃工业职业技术学院,甘肃天水741025)摘要:以NaH粉和Al粉为合成原料,分别采用2%(摩尔分数,x)CeCI。和2%CeCl。H(y=0.02
2、,0.04)为催化添加剂,在室温和3MPa氢压下,通过反应球磨(NaH/AI+CeCI。)和(NaH/AI+CeCIs/H)(y=0.02,0.04)复合物成功制备出Na.AI.H配位氢化物.吸放氢性能测试结果表明,KH的加入能有效改善Na-AI-H体系中第二步脱氢反应放氢动力学性能.(NaH/AI+CeCl。/0.02KH)复合物170。C放氢时可在20min内完成脱氢过程,且在较低温度(100—140。C)下具有良好的可逆吸放氢性能.Kissenger方法计算表明,添加KH可降低Na-Al-H体系第二步脱氢反应的表观活化能,降低其放氢峰值温度.相结构分析表明,KH的添加使Na—AI-H
3、体系中Na3AIHe的晶胞体积发生膨胀,进而提高体系的第二步放氢动力学性能.关键词:配位氢化物:NaAIH:KH;CeCI。:放氢动力学中图分类号:0643InfluenceofKHonReversibleDehydridingPerformanceofNa-AI-HComplexHydrideWANGShun-Kui’LIZhi—JieXIAOXue—Zhang’’FANXiu—Lin’CHENZhi.Wen’LIShou—QuanGEHong—Wei’CHENLi—Xin1_(KeyLaboratoryofAdvancedMaterialsandApplicationsforBatte
4、riesofZh~iangProvince,DepartmentofMaterialsScienceandEng{neering.Zh~iangUniversity,Hangzhou310027.pR.China;2CollegeofGansuVocationalTechnologyTianshui741025,GansuProvince,PR.China)Abstract:TheNa.AI-HcomplexhydridewaspreparedbyreactivebalImilling(NaH/AI+CeCI3)and(NaH/AI+CeCl3H)(y=0.02,0.O4)composit
5、esunderahydrogenpressureof3MPaatroomtemperature,usingNaHandAIpowderasrawmaterials,aswellas2%(molarfraction,x)CeCI3and2%CeCI3,KH(y=0.02,O.04)asdopant,respectively.Thede-,hydrogenationpropertiesshowedthattheadditionofKHcouldeffectivelyImprovethedehydr0genafiOnkineticsoftheseconddecompositionstepfort
6、heNa—Al-Hsystem.The(NaH/Al+CeCI3/0.02KH)compositecompletedthedehydr0genationprocesswithin20minat170。C,withgoodde./hydrogenationcyclingperformancealrelativelyIowternperatures(100-140。C).CalculationbytheKissengermethodshowedthattheadditionofKHdecreasedtheapparenlactivationenergyoftheseconddecomposit
7、ionstepoftheNa—Al-Hsystem.resultinginadecreaseofdesorptionpeaktemperatures.Phasestructureanalysisshowedthatlheenhancedsecondstepdehydr0genatIOnkineticsoftheNa.AI.HcompositesystemwasmainlyascribedtotheIatticevolum
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