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| New insights into the hydrogen storage performance degradation and Al functioning mechanism of LaNi5-xAlx alloys | |
| Liu, JJ; Li, K; Cheng, HH; Yan, K; Wang, Y; Liu, Y; Jin, HM; Zheng, Z | |
| 2017 | |
| Source Publication | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
 |
| ISSN | 0360-3199 |
| Volume | 42Issue:39Pages:24904-24914 |
| Subtype | 期刊论文 |
| Abstract | Rare-earth based AB(5)-type alloys have wide application prospect in many areas such as gaseous hydrogen storage, hydrogen compressing, Ni/MH batteries etc. But opinions on their cycling degradation mechanism remain controversial, hindering them from further improvement. In this study, the hydrogen storage degradation mechanism of LaNi5-xAlx (x = 0, 0.25, 0.5) alloy system is studied using EXAFS as one of the main methods, and meanwhile the functioning mechanism of Al is illustrated. It is found that the hydrogen absorption/desorption plateau becomes tilted and the hydrogen storage capacity is decreased with cycling. These degradation phenomena are caused by the crystal damage due to the lattice strains as well as the mis-occupation of metal atoms during hydrogen absorption/desorption. Al with larger atomic radius stabilizes LaNi5 lattice structure by decreasing the lattice volume expansion rate upon hydrogenation and detaining the atomic migration during cycling, thus significantly improving the alloys' cycling stability from 89.1% (LaNi5) to 98.2% (LaNi4.5Al0.5) after 1000 cycles. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. |
| Keyword | Absorption Fine-structure Metal Hydride Alloys Super-stacking Structure Laves Phase Alloys Ni-based Alloys Electrochemical Performance Absorbing Alloys Sn-substitution Mg La |
| DOI | 10.1016/j.ijhydene.2017.07.213 |
| WOS Keyword | ABSORPTION FINE-STRUCTURE ; METAL HYDRIDE ALLOYS ; SUPER-STACKING STRUCTURE ; LAVES PHASE ALLOYS ; NI-BASED ALLOYS ; ELECTROCHEMICAL PERFORMANCE ; ABSORBING ALLOYS ; SN-SUBSTITUTION ; MG ; LA |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000413125900029 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.sinap.ac.cn/handle/331007/28747 |
| Collection | 中科院上海应用物理研究所2011-2018年 |
| Recommended Citation GB/T 7714 | Liu, JJ,Li, K,Cheng, HH,et al. New insights into the hydrogen storage performance degradation and Al functioning mechanism of LaNi5-xAlx alloys[J]. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,2017,42(39):24904-24914. |
| APA | Liu, JJ.,Li, K.,Cheng, HH.,Yan, K.,Wang, Y.,...&Zheng, Z.(2017).New insights into the hydrogen storage performance degradation and Al functioning mechanism of LaNi5-xAlx alloys.INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,42(39),24904-24914. |
| MLA | Liu, JJ,et al."New insights into the hydrogen storage performance degradation and Al functioning mechanism of LaNi5-xAlx alloys".INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 42.39(2017):24904-24914. |
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| New insights into th（4658KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Download | |
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