Effects of fluoride additives on dehydrogenation behaviors of 2LiBH4+MgH2 system

被引：44
作者：
Kou, Huaqin [1 ]
Xiao, Xuezhang [1 ]
Li, Jinxiu [1 ]
Li, Shouquan [1 ]
Ge, Hongwei [1 ]
Wang, Qidong [1 ]
Chen, Lixin [1 ]
机构：
[1] Zhejiang Univ, Dept Mat Sci & Engn, Hangzhou 310027, Zhejiang, Peoples R China
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2012年 / 37卷 / 01期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
Complex hydride; LiBH4; MgH2; Fluoride additive; Hydrogen storage; HYDROGEN STORAGE PERFORMANCES; LIBH4; LI; CARBON; MG;
D O I：
10.1016/j.ijhydene.2011.03.027
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：
Various additives such as NbF5, TiF3, CeF3, LaF3 and FeF3 were used to dope 2LiBH(4) + MgH2 system and their dehydriding properties were investigated systematically. Among the different additives, NbF5 exhibited the most prominent behavior in terms of fast kinetics and lower the dehydrogenation temperature of 2LiBH(4) + MgH2 system. Differential scanning calorimetry (DSC) shows that 2LiBH(4) + MgH2 system milled with 5 mol% NbF5 lowered the dehydrogenation temperature by 30 degrees C and 58 degrees C for the two-step dehydrogenation compared to neat 2LiBH(4) + MgH2 system. Temperature programmed desorption (TPD) indicates that 2LiBH(4) + MgH2 + 0.05NbF(5) dehydrided completely below 450 degrees C with 8.1 wt.% hydrogen released. Fourier transform infrared spectrometer (FTIR) and X-ray diffraction (XRD) analysis evidence that MgB2 was fully formed after dehydrogenation. Experimental results show that the 2LiBH(4) + MgH2 + 0.05NbF(5) system indeed has good reversible hydriding/dehydriding properties. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：1021 / 1026
页数：6
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