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Int. J. Electroactive Mater. 1 (2013) 13-22

Improved Hydrogen Storage Property of LiAlH4 by Milling with Carbon Based Additives

MOHAMMAD ISMAIL1*, Yue Zhao2, Xuebin Yu3, Shi Xue Dou4

1Department of Physical Sciences, Universiti Malaysia Terengganu, Kuala Terengganu, Terengganu, Malaysia
2School of Mechanical, Materials and Mechatronics Engineering, University of Wollongong, Wollongong, NSW, Australia
3Department of Materials Science, Fudan University, Fudan, Shanghai, China
4Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW, Australia

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Abstract : In this study, LiAlH4/carbon composite systems were prepared by mechanical milling and their hydrogen storage properties investigated. Six different carbon additives: carbon black, carbon nanopowder, graphite, graphene, and single and multiwall carbon nanotubes (SWCNTs and MWCNTs) were used. Among them, SWCNT-metallic particle composite addition resulted in both a decreased decomposition temperature and enhanced desorption kinetics in LiAlH4. The decomposition temperature of the 5 wt.% SWCNT-doped LiAlH4 sample was reduced to 80 ºC and 130 ºC for the first and second stage, respectively, compared with 150 ºC and 180 ºC for as-received LiAlH4. In terms of the desorption kinetics, the 5 wt.% SWCNT-doped LiAlH4 sample released about 4.0 wt.% hydrogen at 95 °C after 35 min dehydrogenation, but the all the other doped samples released less than 0.7 wt.% hydrogen for the same temperature and time. It is believed that the significant improvement in dehydrogenation behaviour of SWCNTs-doped LiAlH4 is due to the combined influence of the SWCNTs structure itself and the catalytic role of the nanostructured metallic particles contained in the SWCNTs.

Keywords : Hydrogen storage,Complex hydride,LiAlH4,carbon based,SWCNTs,