为了改善La-Mg-Ni系A2B7型电极合金的动力学性能,用M(M=Zr,Pr)部分替代合金中的A侧元素La.用真空快淬技术制备了La0.55M0.2Mg0.25Ni3.Co0.2Al0.1(M=Zr,Pr)电极合金,探索了快淬工艺参数对合金电化学贮氢动力学性能的影响.用XRD、SEM及TEM表征了铸态及快淬态合金的结构,结果发现,铸态及快淬态合金均由多相组成,包括两个主相(La,Mg)2 Ni7和LaNi5以及残余相LaNi2.快淬Pr替代合金具有微晶、纳米晶结构,而在快淬Zr替代合金中发现明显的非晶相.电化学测试结果表明,合金的高倍率放电能力随淬速的增加先增加后减小.电化学交流阻抗(EIS)、Tafel极化曲线及电位阶跃测试的结果都表明,合金的电化学贮氢动力学性能随淬速的增加先上升后下降.
参考文献
| [1] | K.Kadir;T.Sakai .Structural investigation and hydrogen storage capacity of LaMg_2Ni_9 and (La_(0.65) Ca_(0.35))(Mg_(1.32) Ca_(0.68))Ni_9 of the AB_2C_9 type structure[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2000(1/2):112-117. |
| [2] | Kohno T.;Yoshida H. .Hydrogen storage properties of new ternary system alloys: La_2MgNi_9, La_5Mg_2Ni_(23), La_3MgNi_(14)[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2000(2):L5-L7. |
| [3] | Y.J. Chai;K. Sakaki;K. Asano .Crystal structure and hydrogen storage properties of La-Mg-Ni-Co alloy with superstructure[J].Scripta materialia,2007(6):545-548. |
| [4] | Hongge Pan;Yongfeng Liu;Mingxia Gao .An investigation on the structural and electrochemical properties of La_(0.7)Mg_(0.3)(Ni_(0.85)Co_(0.15))_x (x = 3.15-3.80) hydrogen storage electrode alloys[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2003(1/2):228-234. |
| [5] | B. Liao;Y.Q. Lei;L.X. Chen .A study on the structure and electrochemical properties of La_2Mg(Ni_(0.95)M_(0.05))_9 (M = Co, Mn, Fe, Al, Cu, Sn) hydrogen storage electrode alloys[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2004(1/2):186-195. |
| [6] | Yongfeng Liu;Yanhui Cao;Li Huang .Rare earth-Mg-Ni-based hydrogen storage alloys as negative electrode materials for Ni/MH batteries[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2011(3):675-686. |
| [7] | Yongfeng Liu;Hongge Pan;Mingxia Gao .Advanced hydrogen storage alloys for Ni/MH rechargeable batteries[J].Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology,2011(13):4743-4755. |
| [8] | Ratnakumar BV.;Bowman RC.;Hightower A.;Fultz B.;Witham C. .ELECTROCHEMICAL STUDIES ON LANI5-XSNX METAL HYDRIDE ALLOYS[J].Journal of the Electrochemical Society,1996(8):2578-2584. |
| [9] | Zheng G.;White RE.;Popov BN. .ELECTROCHEMICAL DETERMINATION OF THE DIFFUSION COEFFICIENT OF HYDROGEN THROUGH AN LANI4.25AL0.75 ELECTRODE IN ALKALINE AQUEOUS SOLUTION[J].Journal of the Electrochemical Society,1995(8):2695-2698. |
| [10] | Y. Wu;W. Han;S.X. Zhou .Microstructure and hydrogenation behavior of ball-milled and melt-spun Mg-10Ni-2Mm alloys[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2008(1/2):176-181. |
| [11] | Hao Niu;Derek O. Northwood .Enhanced electrochemical properties of ball-milled Mg_2Ni electrodes[J].International journal of hydrogen energy,2002(1):69-77. |
| [12] | Yongfeng Liu;Hongge Pan;Mingxia Gao;Yunfeng Zhu;Yongquan Lei;Qidong Wang .The effect of Mn substitution for Ni on the structural and electrochemical properties of La_(0.7)Mg_(0.3)Ni_(2.55-x)Co_(0.45)Mn_x hydrogen storage electrode alloys[J].International journal of hydrogen energy,2004(3):297-305. |
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