简介:TheeffectofMnsubstitutiononphasestructure,hydrogenhydriding/dehydridingproperties(plateaupressureandslope)andreactionheatenthalpyofLaNi4.25-xAl0.75Mnxalloys(x=0,0.25,0.35,0.45,0.55and0.65)werestudied.TheexperimentalresultsshowthatallLaNi4.25-xAl0.75MnxalloyshavesinglephaseandhavethesamehexagonalstructureasthatofLaNi5alloy(CaCu5type,P6/mmm).WithincreasingMnsubstitutioncontent,thecellparametersofLaNi4.25-xAl0.75Mnxalloygreatlyincrease,butthemaximumhydrogenstoragecapacityandtheequilibriumabsorptionpressureofLaNi4.25-xAl0.75Mnxalloydecreasefrom1.38wt.%to1.18wt.%andfrom1.61to0.0712MPa,respectively.Moreover,thehydrogenpressureplateauslopefactorσincreasesfrom0.014to0.18,butthehysteresisfactorisnearlyconstant.Theheatenthalpyabsolutevalue|ΔHplat|increasesfrom46.7kJ·mol-1H2to56.1kJ·mol-1H2astheMncontentxincreasesfrom0to0.65.
简介:基于AB_5的氢存储薄电影(LaNi_(4.25)Al_(0.75)),由dc磁控管劈啪作响的扔的onCu底层在这研究被调查。X光检查衍射(XRD)表明层的微观结构在晶形。SEM和AFM分析证明这部电影看起来与近似在nmdiameter的15-40的众多的随机大小的毛孔相当不平。这部电影的结构的稳定性被DSC,XRD,andS他们,它显示这部电影在500K左右下面维持了它的结构的稳定性,和网络结构的联合分析检验在为30min在700K被加热以后在这部电影上被观察。这些电影的Electrochemicalhydrogen存储性质被模仿的电池测试调查。单人赛分层的LaNi_(4.25)Al_(0.75)大批拍摄类似于典型AB_5合金的展出电气化学的氢存储性质,这被发现,并且这部电影的最大的分泌物能力关于220mAh/g。在20个控告/解除周期以后,小塑造针的铝氧化物在电影表面的一些部分上被形成。