%0 Journal Article
%A Paskevicius, Mark
%A Filsø, Uffe
%A Karimi, Fahim
%A Puszkiel, Julián
%A Pranzas, Philipp Klaus
%A Pistidda, Claudio
%A Hoell, Armin
%A Welter, Edmund
%A Schreyer, Andreas
%A Klassen, Thomas
%A Dornheim, Martin
%A Jensen, Torben R.
%T Cyclic stability and structure of nanoconfined Ti-doped NaAlH<sub>4</sub>
%J International journal of hydrogen energy
%V 41
%N 7
%@ 0360-3199
%C New York, NY [u.a.]
%I Elsevier
%M PUBDB-2016-05317
%P 4159 - 4167
%D 2016
%Z (c) Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. Post referee full text in progress (embargo 1 year from 1 February 2016).
%X NaAlH4 was melt infiltrated within a CO<sub>2</sub> activated carbon aerogel, which had been preloaded with TiCl<sub>3</sub>. 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<sub>4</sub> system where it exists as Al<sub>1−x</sub>Ti<sub>x</sub> 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<sub>4</sub> and its hydrogen uptake occurs through the Na<sub>3</sub>AlH<sub>6</sub> intermediate when confined at this size scale. The hydrogen capacity from the nanoconfined NaAlH<sub>4</sub> is found to initially be much higher in this CO<sub>2</sub> activated aerogel compared with previous studies into unactivated aerogels.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000372378100009
%R 10.1016/j.ijhydene.2015.12.185
%U https://bib-pubdb1.desy.de/record/312128