Effect of ball milling time on the hydrogen storage properties of TiF sub(3)-doped LiAlH sub(4)

In the present work, the catalytic effect of TiF sub(3) on the dehydrogenation properties of LiAlH sub(4) has been investigated. Decomposition of LiAlH sub(4) occurs during ball milling in the presence of 4 mol% TiF sub(3). Different ball milling times have been used, from 0.5 h to 18 h. With ball m...

Full description

Saved in:
Bibliographic Details
Published in:International journal of hydrogen energy 2009-10, Vol.34 (19), p.8079-8085
Main Authors: Liu, Shu-Sheng, Sun, Li-Xian, Zhang, Yao, Xu, Fen, Zhang, Jian, Chu, Hai-Liang, Fan, Mei-Qiang, Zhang, Tao, Song, Xiao-Yan, Grolier, Jean Pierre
Format: Article
Language:English
Subjects:
Ball milling
Catalysts
Crystallites
Dehydrogenation
Hydrogen storage
Intermetallic compounds
Intermetallics
Thermodynamic properties
Titanium aluminides
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In the present work, the catalytic effect of TiF sub(3) on the dehydrogenation properties of LiAlH sub(4) has been investigated. Decomposition of LiAlH sub(4) occurs during ball milling in the presence of 4 mol% TiF sub(3). Different ball milling times have been used, from 0.5 h to 18 h. With ball milling time increasing, the crystallite sizes of LiAlH sub(4) get smaller (from 69 nm to 43 nm) and the dehydrogenation temperature becomes lower (from 80 degree C to 60 degree C). Half an hour ball milling makes the initial dehydrogenation temperature of doped LiAlH sub(4) reduce to 80 degree C, which is 70 degree C lower than as-received LiAlH sub(4). About 5.0 wt.% H sub(2) can be released from TiF sub(3)-doped LiAlH sub(4) after 18 h ball milling in the range of 60 degree C-145 degree C (heating rate 2 degree C min super(-1)). TiF sub(3) probably reacts with LiAlH sub(4) to form the catalyst, TiAl sub(3). The mechanochemical and thermochemical reactions have been clarified. However, the rehydrogenation of LiAlH sub(4)/Li sub(3)AlH sub(6) can not be realized under 95 bar H sub(2) in the presence of TiF sub(3) because of their thermodynamic properties.
ISSN:0360-3199
DOI:10.1016/j.ijhydene.2009.07.090