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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 PublicationINTERNATIONAL JOURNAL OF HYDROGEN ENERGY
ISSN0360-3199
Volume42Issue:39Pages:24904-24914
Subtype期刊论文
AbstractRare-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.
KeywordAbsorption Fine-structure Metal Hydride Alloys Super-stacking Structure Laves Phase Alloys Ni-based Alloys Electrochemical Performance Absorbing Alloys Sn-substitution Mg La
DOI10.1016/j.ijhydene.2017.07.213
WOS KeywordABSORPTION FINE-STRUCTURE ; METAL HYDRIDE ALLOYS ; SUPER-STACKING STRUCTURE ; LAVES PHASE ALLOYS ; NI-BASED ALLOYS ; ELECTROCHEMICAL PERFORMANCE ; ABSORBING ALLOYS ; SN-SUBSTITUTION ; MG ; LA
Indexed BySCI
Language英语
WOS IDWOS:000413125900029
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://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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