La 和 Ce 对 Y 的等效替代对 A2B7 型 La-Y-Ni-Based 储氢合金结构和性能的影响

IF 3.3 3区 化学 Q2 CHEMISTRY, PHYSICAL
Guandong Xu, Xiangyang He, Yucheng Ma, Shujuan Zhou, Xu Zhang, Yuyuan Zhao, Wei Xiong, Baoquan Li, Li Wang, Huizhong Yan
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引用次数: 0

摘要

采用真空感应淬火工艺制备了 A2B7 型 (LaCe)xY6-2xNi18.5Mn1.5Al(x = 0.95、1.00、1.15、1.20、1.25、1.30)合金,并在 1148 K 下退火 16 h。通过 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、压力-成分-温度曲线 (PCT) 和电化学方法测试了合金的结构和性能。结果发现,合金主要由 Ce2Ni7 (2H) 和 Gd2Co7 (3R) 相组成,Y 含量的减少有利于 Ce2Ni7 相的形成。在用等量的 La 和 Ce 部分替代 Y 的情况下,具有适度 Y/(LaCe)比的合金电极具有相对较大的放电容量,而容量保持率则在 100 次循环后从 63.2%(x = 0.95)逐渐增加到 69.2%(x = 1.30)。Y 含量最高的合金具有良好的氢扩散能力和表面活性,因此电化学动力学性能最好。这项工作为 La-Y-Ni 基储氢合金的成分优化提供了新的思路和理论指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effect of Equivalent La and Ce Substitution for Y on the Structure and Properties of A2B7-Type La–Y–Ni-Based Hydrogen Storage Alloys

Effect of Equivalent La and Ce Substitution for Y on the Structure and Properties of A2B7-Type La–Y–Ni-Based Hydrogen Storage Alloys
A2B7-type (LaCe)xY6–2xNi18.5Mn1.5Al (x = 0.95, 1.00, 1.15, 1.20, 1.25, 1.30) alloys were prepared by a vacuum induction-quenching process and annealed at 1148 K for 16 h. The structure and properties of the alloys were tested by X-ray diffraction (XRD), scanning electron microscopy (SEM), pressure–composition–temperature curve (PCT), and electrochemical methods. It is found that the alloys are mainly composed of the Ce2Ni7 (2H) and Gd2Co7 (3R) phase, and a decrease of the Y content is beneficial to the formation of the Ce2Ni7 phase. With the partial substitution of Y by equivalent La and Ce, the alloy electrodes with a moderate Y/(LaCe) ratio have relatively large discharge capacity, while the capacity retention rate increases gradually from 63.2% (x = 0.95) to 69.2% (x = 1.30) after 100 cycles. The alloy with the highest Y content shows the best electrochemical kinetic performance due to good hydrogen diffusion ability and surface reactivity. This work provides new ideas and theoretical guidance for the composition optimization of La–Y–Ni-based hydrogen storage alloys.
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来源期刊
The Journal of Physical Chemistry C
The Journal of Physical Chemistry C 化学-材料科学:综合
CiteScore
6.50
自引率
8.10%
发文量
2047
审稿时长
1.8 months
期刊介绍: The Journal of Physical Chemistry A/B/C is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, and chemical physicists.
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