Increasing de-/hydriding capacity and equilibrium pressure by designing non-stoichiometry in Al-substituted YFe2 compounds

标题

Increasing de-/hydriding capacity and equilibrium pressure by designing non-stoichiometry in Al-substituted YFe2 compounds

作者

作者:Li, ZM (Li, Ziming)^[1,2 ]; Wang, H (Wang, Hui)^[1,2,3 ]; Ouyang, LZ (Ouyang, Liuzhang)^[1,2,3 ]; Liu, JW (Liu, Jiangwen)^[1,2,3 ]; Zhu, M (Zhu, Min)^[1,2,3 ]

期刊信息

摘要

Non-stoichiometric YFe1.5Al0.5-x,YFe1.6Al0.4-x and YFe1.7+xAl0.3 (x = 0.1 and 0.2) compounds with single C15 Laves phase were successfully prepared. Compared with stoichiometric compounds, enhanced hydrogenation capacity and hydrogen absorption rate were obtained in hypo-stoichiometric compounds, and increased dehydrogenation equilibrium pressure was achieved for hyper-stoichiometric compounds. The YFe1.6Al0.2 compound shows the maximum reversible absorption capacity of 3.04 H/f.u. (1.63 wt.%), which is 18% higher than that of YFe1.5Al0.5. Faster hydrogenation kinetics could be obtained in all of the hypo-stoichiometric samples, completing hydrogenation within 300 s at 100 degrees C. The YFe1.7+xAl0.3 compounds showed elevated desorption equilibrium pressure, indicating higher dehydrogenation capacity than that of stoichiometric compounds. The present work demonstrates the positive effect of non-stoichiometry on the Y-Fe-Al ternary compounds and plays a guiding role for improving the hydrogen storage properties of AB(2)-type rare earth-transition metal alloys. (C) 2017 Elsevier B.V. All rights reserved.

关键词

作者关键词:Hydrogen storage compounds; YFe2; Al substitution; Non-stoichiometric

作者信息

作者信息

通讯作者地址:Zhu, M (通讯作者)

South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510641, Guangdong, Peoples R China.   增强组织信息的名称     South China University of Technology

通讯作者地址:Zhu, M (通讯作者)

South China Univ Technol, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Guangdong, Peoples R China.   增强组织信息的名称     South China University of Technology

地址:

	[ 1 ] South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510641, Guangdong, Peoples R China   增强组织信息的名称     South China University of Technology
	[ 2 ] South China Univ Technol, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Guangdong, Peoples R China   增强组织信息的名称     South China University of Technology
	[ 3 ] South China Univ Technol, China Australia Joint Lab Energy & Environm Mat, Guangzhou 510641, Guangdong, Peoples R China   增强组织信息的名称     South China University of Technology

电子邮件地址:memzhu@scut.edu.cn

出版商

ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND

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