Hydrogen storage properties of LiNH2-LiH system with MgH2, CaH2 and TiH2 added

被引：27
作者：
Amica, G. [1 ]
Arneodo Larochette, P. [1 ]
Gennari, F. C. [1 ]
机构：
[1] Univ Nacl Cuyo, Ctr Atom Bariloche CNEA, Inst Balseiro, CONICET, San Carlos De Bariloche, Rio Negro, Argentina
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2015年 / 40卷 / 30期
关键词：
Lithium amide; Ball milling; Calcium hydride; Magnesium hydride; Kinetics; N-H SYSTEM; REACTION PATHWAY; DESORPTION; ABSORPTION; CATALYST;
D O I：
10.1016/j.ijhydene.2015.05.091
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：
The addition of different metal hydrides to Li-N-H system offers a possible way to modify its thermodynamic properties and/or the dehydrogenation/hydrogenation kinetics. In this paper we report the hydrogen storage properties of LiNH2-LiH system with MH2 added (M = Mg, Ca, Ti) and clarify the chemical interactions occurring during hydrogen cycling. Detailed structural investigations reveal that during heating under hydrogen, MH2 (M = Mg, Ca) reacts with LiNH2 to form Li2Mg(NH)(2) and 2CaNH-Ca(NH2)(2) solid solution, with simultaneous hydrogen release. Formation of the Li2NH-CaNH mixture after dehydrogenation of the LiNH2-LiH with CaH2 added is proved by XRPD and FTIR, providing a new reversible pathway for hydrogen storage in the Li-Ca-N-H system. Notable improvement in the dehydrogenation temperature and kinetics was observed for LiNH2-LiH system with CaH2 and MgH2 added, without clear effects in the case of TiH2. The kinetic analysis reveals that dehydrogenation process is diffusion-controlled and the beneficial effect of MgH2 and CaH2 is due to the enhancement of Li+ mobility. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：9335 / 9346
页数：12
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