Silane-based hydrogen storage materials for fuel cell application: Hydrogen release via methanolysis and regeneration by hydride reduction from organosilanes
- Silane-based hydrogen storage materials for fuel cell application: Hydrogen release via methanolysis and regeneration by hydride reduction from organosilanes
- 한원식; 김태진; 김성관; 김용민; 김영천; 남석우; 강상욱
- Hydrosilane; Hydrogen storage material; Regeneration; PEMFC power pack
- Issue Date
- International journal of hydrogen energy
- VOL 36, NO 19, 12305-12312
- 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.
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