New insights into the hydrogen storage performance degradation and Al functioning mechanism of LaNi5-xAlx alloys

doi:10.1016/j.ijhydene.2017.07.213

CAS OpenIR > 中科院上海应用物理研究所2011-2018年

	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
发表期刊	INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
ISSN	0360-3199
卷号	42 期号:39 页码:24904-24914
文章类型	期刊论文
摘要	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.
关键词	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
关键词[WOS]	ABSORPTION FINE-STRUCTURE ; METAL HYDRIDE ALLOYS ; SUPER-STACKING STRUCTURE ; LAVES PHASE ALLOYS ; NI-BASED ALLOYS ; ELECTROCHEMICAL PERFORMANCE ; ABSORBING ALLOYS ; SN-SUBSTITUTION ; MG ; LA
收录类别	SCI
语种	英语
WOS记录号	WOS:000413125900029
引用统计
文献类型	期刊论文
条目标识符	http://ir.sinap.ac.cn/handle/331007/28747
专题	中科院上海应用物理研究所2011-2018年
推荐引用方式 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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