采用X射线衍射、差热分析及电化学方法,研究了吸氢合金LaNi5-xMx(M=Mn,Co,Fe,Cr,Al)在高温氢化反应时的歧化行为及其反应产物的电化学性能. LaNi5-xMx在2.5 MPa氢压和550℃以上保温一定时间后可发生明显的歧化反应, 并析出纳米相镍. 歧化反应的程度与加热温度、时间、第三组元M及合金的生成焓关系密切. 电化学交换电流密度测定表明, 经歧化反应得到的含纳米相镍的复相组织与原始合金组织相比具有较高的吸放氢电催化活性.
参考文献
[1] | WANG X L;SUDA S.Surface study of chemically treated LaNi4.7Al0.3 alloy[J].Journal of Alloys and Compounds,1993(194):73-76. |
[2] | Zhang SG.;Nohara S.;Morikawa T.;Inoue H.;Iwakura C.;Yorimitsu K. .Surface analysis of an amorphous MgNi alloy prepared by mechanical alloying for use in nickel metal hydride batteries[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,1998(1/2):123-126. |
[3] | NOTTON P H L;EINNERHAND R E F;DAMS J L C .Non-stoichiometric hydride-forming compounds:an excellent combination of long-term stability and high electrocatajytic activity[J].Zeitschrift für Physikalische Chemie,1994,183(05):267-279. |
[4] | 小川孝寿;大西敬三;桃野正 等.一方向凝固した耐微粉化性LaNi5-Ni共晶系水素贮藏合金の制备[J].日本金属学会志(日本),1987,51(02):102-110. |
[5] | WILSON A J C.X-ray Optics[M].London:Methuen,1949:65. |
[6] | MUSHIKOV N V;YEEMAKOV A;ZAJKOV N K.Hydriding proporties of Pr(Co1-xCux)5 intermetallic compounds[J].Journal of Alloys and Compounds,1997(260):12-16. |
[7] | 大角泰章;吴永宽;苗艳秋.金属氢化物的性质及应用[M].北京:化学工业出版社,1990:55. |
[8] | MIEDEMA A R;DE CHATEL P F;DE BOER F R.Cohesion in alloys-fundamentals of a semi-empirical model[J].Physica,1980(100B):1-28. |
[9] | NIESSEN A K;DE BOER F R;BOOM R et al.Model predictions for formation of transition metalal loys Ⅱ[J].Calphad-Computer Coupling of Phase Diagrams and Thermochemistry,1983,7(01):51-57. |
[10] | 鄢晓华;康卫华;乔芝郁 等.三元合金生成热的一种计算方法[J].中国稀土学报,1994,12(03):218-221. |
[11] | GEUN-HONG KIM;SOO-GEUN LEE;KI-YOUNG LEE;CHANG-HWAN CHUN;JAI-YOUNG LEE .OBSERVATION OF THE DEFECTS INDUCED BY HYDROGEN ABSORPTION AND DESORPTION IN LaNi_5[J].Acta Metallurgica et Materialia,1995(6):2233-2240. |
[12] | 赵爽;林勤;陈宁 等.LaNi5-xMx合金氢化物贮氢性能的计算与预报[J].金属学报,1999,35(01):65-69. |
[13] | 康龙,罗永春.LaNi5-xAlx贮氢合金的研究[J].稀土,1997(02):6. |
[14] | 田昭武.电化学研究方法[M].北京:科学出版社,1984 |
[15] | HUOT J Y;TRUDEAU M L;SCHULZ R .Low hydrogen overpotential nanocrystalline Ni-Mo cathodes for alkaline water electrolysis[J].Journal of the Electrochemical Society,1993,138(05):21-24. |
[16] | 刘宪伟 .复相贮氢合金及其制法[P].CN 1089307A,1994-07-13. |
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