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首页> 外文期刊>Materials Science and Engineering. B, Solid-State Materials for Advanced Technology >Systematic investigation on hydrogen storage properties of RNi_5 (R: rare earth) intermetallic compounds with multi-plateau
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Systematic investigation on hydrogen storage properties of RNi_5 (R: rare earth) intermetallic compounds with multi-plateau

机译：多平台RNi_5（R：稀土）金属间化合物储氢特性的系统研究

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摘要

We investigated the pressure-composition (P-C) isotherms of several binary Rni_5 (R = La, Ce, Pr, Nd, Sm and Gd) intermetallic compounds to clarify the correlation of the hydrogen storage properties between multi-plateaux. It was found that all Rni_5 compounds have similar P-C isotherms with two well-separated plateaux except for CeNi_5, indicating that two hydrides with compositions of Rni_5H_(3-4) and Rni_5H_(6-7) are formed. With increasing the atomic number of R element in the Rni_5 compounds, the unit cell volume decreases due to the decrease of the radius of the R element. This influences the absolute enthalpies of dehydrogenation |DELTA H| of both hydrides (beta and gamma) to decrease, which consequently leads to the increase of the second plateau pressure as well as the first plateau. Contrary to LaNi_5-H_2 system, the |DELTA H| of gamma hydride is smaller than that of |DELTA H| of beta hydride for the other systems, which indicates that the pressure gap between two plateau pressures expands with decreasing temperature. The second plateau tends to disappear with large atomic number of R element because the |DELTA H| value approaches to zero.
机译：我们研究了几种二元Rni_5（R = La，Ce，Pr，Nd，Sm和Gd）金属间化合物的压力-组成（P-C）等温线，以阐明多平台之间氢存储特性的相关性。发现除了CeNi_5之外，所有Rni_5化合物具有相似的P-C等温线，具有两个充分分离的平台，表明形成了具有Rni_5H_（3-4）和Rni_5H_（6-7）组成的两个氢化物。随着Rni_5化合物中R元素的原子数增加，由于R元素的半径减小，晶胞体积减小。这会影响脱氢的绝对焓| DELTA H |。两种氢化物（β和γ）的总和降低，因此导致第二平台压力以及第一平台压力的增加。与LaNi_5-H_2系统相反，| DELTA H |氢化物的| H |小于| DELTA H | β氢化物在其他系统中的分布，表明两个平台压力之间的压力差随着温度的降低而扩大。由于| DELTA H |，第二平稳期倾向于随着R原子的原子数增加而消失。值接近零。

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