Silane-based hydrogen storage materials for fuel cell application: Hydrogen release via methanolysis and regeneration by hydride reduction from organosilanes

Title
Silane-based hydrogen storage materials for fuel cell application: Hydrogen release via methanolysis and regeneration by hydride reduction from organosilanes
Authors
한원식김태진김성관김용민김영천남석우강상욱
Keywords
Hydrosilane; Hydrogen storage material; Regeneration; PEMFC power pack
Issue Date
2011-09
Publisher
International journal of hydrogen energy
Citation
VOL 36, NO 19, 12305-12312
Abstract
A series of cyclic- and linear organosilanes, 1e5, was prepared and examined as potential hydrogen storage materials. When a stoichiometric amount of methanol was added to a mixture of cyclic organosilane, (CH2SiH2)3 (1) or (CH2SiH2CHSiH3)2 (2), and 5 mol% NaOMe, rapid hydrogen release was observed at room temperature within 10e15 s. The hydrogen storage capacities of compounds 1 and 2 were estimated to be 3.70 and 4.04 wt.-% H2, respectively. However, to ensure the complete methanolysis from organosilanes including methanol evaporation at exothermic dehydrogenation condition, two equivs of methanol were used. The resulting methoxysilanes, (CH2Si(OMe)2)3 (6) and (CH2Si(OMe)2CHSi(OMe)3)2 (7), were regenerated to the starting organosilanes in high yields by LiAlH4 reduction. Linear organosilanes, SiH3CH2SiH2CH2SiH3 (3), SiH3CH2CH(SiH3)2 (4), and SiH3CH2CH(SiH3) CH2SiH3 (5) also showed fast hydrogen release kinetics at room temperature with hydrogen storage capacities of 4.26, 4.55, and 4.27 wt.% H2, respectively; the corresponding methoxysilanes were successfully regenerated by LiAlH4. Compound 1 was further tested as hydrogen source for fuel cell operation.
URI
http://pubs.kist.re.kr/handle/201004/41220
ISSN
0360-3199
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