Hydrogen release from sodium alanate observed by time-resolved neutron backscattering
نویسندگان
چکیده
منابع مشابه
Vacancy-mediated dehydrogenation of sodium alanate.
Clarification of the mechanisms of hydrogen release and uptake in transition-metal-doped sodium alanate, NaAlH(4), a prototypical high-density complex hydride, has fundamental importance for the development of improved hydrogen-storage materials. In this and most other modern hydrogen-storage materials, H(2) release and uptake are accompanied by long-range diffusion of metal species. Using firs...
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Doping NaAlH(4) with Ti-catalyst has produced a promising hydrogen storage system that can be reversibly operated at moderate temperature conditions. Of the various dopant precursors, TiCl(3) was well recognized due to its pronounced catalytic effect on the reversible dehydrogenation processes of sodium aluminium hydrides. Quite recently we experimentally found that TiF(3) was even better than ...
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A novel method for detection of hydrogen by an electron beam in extremely thin samples is described. Elastically scattered electrons impinging with 20-30 keV on a thin formvar film were detected at a scattering angle near 45 degrees. In these large momentum transfer elastic collisions a clear separation of the signal of hydrogen and heavier elements was found. By changing the momentum transfer ...
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We have performed first-principles calculations of thick slabs of Ti-doped sodium alanate sNaAlH4d, which allows one to study the system energetics as the dopant progresses from the surface to the bulk. Our calculations predict that Ti stays on the surface, substitutes for Na, and attracts a large number of H atoms to its vicinity. Molecular dynamics simulations suggest that the most likely pro...
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We have clarified the adsorption and release mechanism of hydrogen to/from Pt clusters on an MCM-41 surface by using the XAFS technique. After reduction, the icosahedral Pt13 cluster of r(Pt-Pt) =0.273 nm is formed. In contrast, a very small oxidized metal particle of r(Pt-Pt) = 0.254 nm is formed after the oxidation. We have measured time-resolved energy dispersive XAFS in order to clarify the...
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ژورنال
عنوان ژورنال: Journal of Physics: Condensed Matter
سال: 2011
ISSN: 0953-8984,1361-648X
DOI: 10.1088/0953-8984/23/25/254214