The phase structure and hydrogen storage properties of LaMg3.70Ni1.18 alloy were investigated.The LaMg3.70Ni1.19 alloy consists of main LaMg2Ni phase,minor La2Mg17 and LaMg3 phases.The alloy can be activated in the first hydriding/dehydriding process,and initial LaMg2Ni,La2Mg17,and LaMg3 phases transfer to LaH2.34,Mg,and Mg2Ni phases after activation.The reversible hydrogen storage capacity of the LaMg3.70Ni1.18 alloy is 2.47 wt.％ at 558 K,which is higher than that of the LaMg2Ni alloy.The pressure-composition-temperature (PCT) curves display two hydriding plateaus,corresponding to the formation of MgH2 and Mg2NiH4.However,only one dehydriding plateau is observed,owing to the synergetic effect of hydrogen desorption between MgH2 and Mg2NiH4.The uptake time for hydrogen content to reach 99％ of saturated state is less than 250 s,and 90％ hydrogen can be released in 1200 s in the experimental conditions,showing fast kinetics in hydriding and dehydriding.The activation energies of the LaMg3.70Ni1.18 alloy are -51.5 ± 1.1 kJ/mol and -57.0 ± 0.6 kJ/mol for hydriding and dehydriding,respectively.The hydriding/dehydriding kinetics of the LaMg3.70Ni1.18 alloy is better than that of the Mg2Ni alloy,owing to the lower activation energy values.
参考文献
| [1] | Lu, J;Choi, YJ;Fang, ZZ;Sohn, HY;Ronnebro, E .Hydrogen Storage Properties of Nanosized MgH2-0.1TiH(2) Prepared by Ultrahigh-Energy-High-Pressure Milling[J].Journal of the American Chemical Society,2009(43):15843-15852. |
| [2] | Bogdnovic B;Harwing T.H;Spliethoff B .The development,testing and optimization of energy storage materials based on the MgH2-Mg system[J].International Journal of Hydrogen Energy,1993,18:575. |
| [3] | Choi Y.J;Choi J.W;Sohn H.Y;Ryu T Hwang K.S and Fang Z.Z .Chemical vapour synthesis of Mg-Ti nanopowder mixture as a hydrogen storage material[J].International Journal of Hydrogen Energy,2009,34:7700. |
| [4] | Ouyang L.Z;Yang X.S;Dong H.W;Zhu M .Structure and hydrogen storage properties of Mg3Pr and Mg3PrNio.1 alloy[J].Scripta Materialia,2009,61:339. |
| [5] | Ouyang LZ;Qin FX;Zhu M .The hydrogen storage behavior of Mg3La and Mg3LaNi0.1[J].Scripta materialia,2006(12):1075-1078. |
| [6] | Song Y;Guo Z.X;Yang R .Influence of selected alloying elements on the stability of magnesium dihydride for hydrogen storage applications:a first principles investigation[J].Physical Review B,2004,69:094205. |
| [7] | Glage A;Ceccato R;Lonardelli I;Girardi F Agresti F Principi G Molinari A and Gialanell S .A powder metallurgy approach for the production of a MgH2-Al composite material[J].Journal of Alloys Compdl,2009,478:273. |
| [8] | Tanak K;Miwa T;Sasaki K;Kuroda K .TEM studies of nanostructure in melt-spun Mg-Ni-La alloy manifesting enhanced hydrogen desorbing kinetics[J].Journal of Alloys and Compounds,2009,478:308. |
| [9] | Xie D.H;Li P;Zeng C.X;Sun J.W and Qu X.H .Effect of substitution of Nd for Mg on the hydrogen storage properties of Mg2Ni alloy[J].Journal of Alloys and Compounds,2009,478:96. |
| [10] | Ren H;Zhang Y;Li B;Zhao D Guo S and Wang X .Influence of the substitution of La for Mg on the microstructure and hydrogen storage characteristics of Mg20-xLaxNi10 (x =0-6) alloys[J].International Journal of Hydrogen Energy,2009,34:1429. |
| [11] | Ouyang L.Z;Yao L;Dong H.W;Li L.Q and Zhu M .Hydrogen storage properties of LaMg2Ni prepared by induction melting[J].Journal of Alloys and Compounds,2009,485:507. |
| [12] | Chio M.D;Ziggiotti A;Baricco M .Effect of microstructure on hydrogen absorption in LaMg2Ni[J].Intermetallics,2008,16:102. |
| [13] | Zaluska A;Zaluski L;Str(o)m-Olsen J.O .Synergy of hydrogen sorption in ball-milled hydrides of Mg and Mg2Ni[J].Journal of Alloys and Compounds,1999,289:197. |
| [14] | Blomqvist H;R(o)nnebro E;Noréus D;Kuji T .Competing stabilisation mechanisms in Mg2NiH4[J].Journal of Alloys and Compounds,2002,330-332:286. |
| [15] | Stampfer J.J;Holley C.E;Suttle J.F .The magnesium-hydrogen system[J].Journal of the American Chemical Society,1960,82:3504. |
| [16] | Qian Li;Kuo-Chih Chou;Qin Lin;Li-Jun Jiang;Feng Zhan .Hydrogen absorption and desorption kinetics of Ag-Mg-Ni alloys[J].International journal of hydrogen energy,2004(8):843-849. |
| [17] | Li Q;Chou K.C;Lin Q;Jiang L.J and Zhan F .Influence of the initial hydrogen pressure on the hydriding kinetics of the Mg2-xAlxNi (x =0,0.1) alloys[J].International Journal of Hydrogen Energy,2004,29:1383. |
| [18] | Hu L;Han S.M;Li J;Yang C Li Y and Wang M.Z .Phase structure and hydrogen absorption property of LaMg2Cu[J].Materials Science and Engineering B:Solid-state materials for advanced technology,2010,166:209. |
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