Hydrogen storage properties of Li-Ca-N-H system with different molar ratios of LiNH2/CaH2

被引：30

作者：

Chu, Hailiang ^{[1
]}

Xiong, Zhitao ^{[1
]}

Wu, Guotao ^{[1
]}

He, Teng ^{[1
]}

Wu, Chengzhang ^{[1
]}

Chen, Ping ^{[1
]}

机构：

[1] Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2010年 / 35卷 / 15期

关键词：

Lithium amide; Calcium hydride; Hydrogen desorption; Structure; LINH2/MGH2; MIXTURE; COMPLEX HYDRIDES; IMIDES; AMIDE;

D O I：

10.1016/j.ijhydene.2009.12.009

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this work, dehydrogenation and rehydrogenation of three LiNH2/CaH2 samples with LiNH2/CaH2 molar ratio of 2/1, 3/1 and 4/1 were systematically investigated. Remarkable differences were observed in the temperature dependence of hydrogen desorption and subsequent absorption. LiNH2/CaH2 in a molar ratio of 2/1 transforms to ternary imide Li2Ca(NH)(2) after desorbing about 4.5 wt.% H-2 at 350 degrees C. And it has a reversible hydrogen storage capacity of 2.7 wt.% at 200 degrees C. As for the LiNH2/CaH2 mixture in a molar ratio of 4/1, it transforms to a new compound with a composition of Li4CaN4H6 after being dehydrogenated at 350 degrees C. The rehydrogenation of both LiCa(NH)(2) and Li4CaN4H6 gives LiNH2, LiH and the solid solution of 2CaNH-Ca(NH2)(2). (C) 2009 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.

引用

页码：8317 / 8321

页数：5

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