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| Home > Publications database > Cyclic stability and structure of nanoconfined Ti-doped $\mathrm{NaAlH_{4}}$ |
| Home > Publications database > Cyclic stability and structure of nanoconfined Ti-doped $\mathrm{NaAlH_{4}}$ |
| Journal Article | PUBDB-2016-05317 |
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2016
Elsevier
New York, NY [u.a.]
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Please use a persistent id in citations: doi:10.1016/j.ijhydene.2015.12.185
Abstract: NaAlH4 was melt infiltrated within a CO$_2$ activated carbon aerogel, which had been preloaded with TiCl$_3$. Nanoconfinement was verified by Small Angle X-Ray Scattering (SAXS) and the nature of the Ti was investigated with Anomalous SAXS (ASAXS) and X-Ray Absorption Near Edge Structure (XANES) to determine its size and chemical state. The Ti is found to be in a similar state to that found in the bulk Ti-doped NaAlH$_4$ system where it exists as Al$_{1−x}$Ti$_x$ nanoalloys. Crystalline phases exist within the carbon aerogel pores, which are analysed by in-situ Powder X-Ray Diffraction (PXD) during hydrogen cycling. The in-situ data reveals that the hydrogen release from NaAlH$_4$ and its hydrogen uptake occurs through the Na$_3$AlH$_6$ intermediate when confined at this size scale. The hydrogen capacity from the nanoconfined NaAlH$_4$ is found to initially be much higher in this CO$_2$ activated aerogel compared with previous studies into unactivated aerogels.
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