Effect of non-stoichiometry on hydrogen storage properties of La(Ni3.8Al1.0Mn0.2)x alloys
Effect of non-stoichiometry on hydrogen storage properties of La(Ni3.8Al1.0Mn0.2)x alloys
复制标题
非化学计量对La(Ni3.8Al1.0Mn0.2)x合金储氢性能的影响
DOI：
10.1016/j.ijhydene.2010.01.102
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发表时间：
2010-04
影响因子：
7.2
通讯作者：
Li, S. L.
中科院分区：
文献类型：
--
作者：
Wang, P.;Luo, G.;Chen, W.;Chen, D. M.;Yang, K.;Li, S. L.
研究了La（Ni 3.8Al 1.0Mn 0.2）x（x= 0.94，0.96，0.98，1.0）贮氢合金的非化学计量比对合金的晶体结构、活化性能、吸放氢性能和循环寿命的影响。结果表明，对于化学计量比的化合物，只有单相的CaCu5型结构存在。而对于AB5合金的贫硼化合物，则以CaCu5型相为主，并含有少量的第二相，当x≥0.96时，第二相的数量随x的减小而增加，当x=0.96时，第二相的数量达到最大值。随着x的减小，激活变得更难，直到x=0.96，当x减小到0.94时，激活变得更容易。当x≥0.96时，随着x的减小，平台压力增大，吸氢量减小，当x进一步减小到0.94时，平台压力减小，吸氢量增大。可以通过半高宽（FWHM）估计的晶格应变的变化和合金的斜率因子Sfin的程度都显示出与x的变化相同的趋势，在x=0.96处表现出最大值。当x≥0.96时，ΔH随x的减小而减小，当x=0.94时，Δ H随x的减小而增大，并且发现晶胞体积越大，Δ H的绝对值越大。非化学计量比的加入大大提高了合金的抗粉化性能。合金的动力学非常快，几乎不受非化学计量比x变化的影响。经过300次吸放氢循环后，化学计量比和非化学计量比合金的吸氢量基本保持不变，但颗粒尺寸大大减小。
The La(Ni3.8Al1.0Mn0.2)x(x=0.94, 0.96, 0.98, 1.0) hydrogen storage alloys have been investigated to examine the effect of non-stoichiometry on the crystal structure, activation performance, hydrogen absorption/desorption properties and cycle life. It was found that for the stoichiometric compound, only single phase with CaCu5type structure exists. However, for B-poor compounds of AB5alloys, there is a principal CaCu5type phase with a small amount of second phase and the amount of second phase increased with decreasing x when x≥0.96 and reached a maximum when x=0.96. The activation becomes harder with decreasing x until x=0.96 and easier when x decreased to 0.94. The plateau pressure increased and the hydrogen uptake capacity decreased with decreasing x when x≥0.96, and then decreased and increased, respectively, when x further decreased to 0.94. Both the change in the lattice strain which could be estimated by FWHM (full width at half maximum) and the degree of slope factor Sfin the alloys show the same trend with the change of x, exhibiting a maximum at x=0.96. The ΔH decreased with decreasing x when x≥0.96 and then increased when x=0.94 and it was found that the larger the cell volume, the larger the absolute value of the enthalpy. The pulverization resistance of the alloys was greatly improved by the non-stoichiometric. The kinetics of the alloys was very fast and almost not influenced by the change of non-stoichiometric x. After 300 absorption/desorption cycles, the hydrogen uptake capacity of the stoichiometric and non-stoichiometric alloys almost kept the same, but the particle size decreased greatly.
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影响因子：
6.2
作者：
Chan-Yeol Seo;Seung-Jun Choi;Jeon Choi;Choong-Nyeon Park;P. S. Lee;Jai-Young Lee
通讯作者：
Chan-Yeol Seo;Seung-Jun Choi;Jeon Choi;Choong-Nyeon Park;P. S. Lee;Jai-Young Lee
影响因子：
6.2
作者：
H. Ye;Hongjie Zhang;J. Cheng;T. S. Huang
通讯作者：
H. Ye;Hongjie Zhang;J. Cheng;T. S. Huang
影响因子：
6.2
作者：
H. H. Cheng-H.;H. Yang;Shenlan Li;Xuguang Deng;D. M. Chen;K. Yang
通讯作者：
H. H. Cheng-H.;H. Yang;Shenlan Li;Xuguang Deng;D. M. Chen;K. Yang
影响因子：
6.6
作者：
C. Iwakura;T. Oura;H. Inoue;M. Matsuoka
通讯作者：
C. Iwakura;T. Oura;H. Inoue;M. Matsuoka
影响因子：
7.2
作者：
Xuebin Yu;Jinzhou Chen;Zhongdao Wu;B. Xia;Naixin Xu
通讯作者：
Xuebin Yu;Jinzhou Chen;Zhongdao Wu;B. Xia;Naixin Xu