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  Investigation of hydrogen discharging and recharging processes of Ti-doped NaAlH4 by X-ray diffraction analysis (XRD) and solid-state NMR spectroscopy

Bogdanović, B., Felderhoff, M., Germann, M., Härtel, M., Pommerin, A., Schüth, F., et al. (2003). Investigation of hydrogen discharging and recharging processes of Ti-doped NaAlH4 by X-ray diffraction analysis (XRD) and solid-state NMR spectroscopy. Journal of Alloys and Compounds, 350(1-2), 246-255. doi:10.1016/S0925-8388(02)00953-2.

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 Creators:
Bogdanović, B.1, Author
Felderhoff, M.2, Author           
Germann, M.2, Author           
Härtel, M.2, Author           
Pommerin, A.2, Author           
Schüth, F.2, Author           
Weidenthaler, C.2, Author           
Zibrowius, B.3, Author           
Affiliations:
1Research Group Bogdanović, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_persistent22              
2Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
3Service Department Mynott (NMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445627              

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Free keywords: Hydrogen absorbing materials; Metal hydrides; Gas-solid reaction; Nuclear resonances
 Abstract: The processes occurring in the course of two sequential hydrogen discharging and recharging cycles of Ti-doped sodium alanate were investigated in parallel using XRD analysis and solid-state NMR spectroscopy. Both methods demonstrate that in hydrogen storage cycles (Eq. (1)) the majority phases involved are NaAlH4, Na3AlH6, Al and NaH. Only traces of other, as yet unidentified phases are observed, one of which has been tentatively assigned to an Al–Ti alloy on the basis of XRD analysis. The unsatisfactory hydrogen storage capacities heretofore observed in cycle tests are shown to be due entirely to the reaction of Na3AlH6 with Al and hydrogen to NaAlH4 (Eq. (1), 2nd hydrogenation step) being incomplete. Using XRD and NMR methods it has been shown that a higher level of rehydrogenation can be achieved by adding an excess of Al powder.

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Language(s): eng - English
 Dates: 2002-04-172002-08-052002-12-052003-02-17
 Publication Status: Published in print
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/S0925-8388(02)00953-2
 Degree: -

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Title: Journal of Alloys and Compounds
  Abbreviation : J. Alloy. Comp.
Source Genre: Journal
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Publ. Info: Lausanne, Switzerland : Elsevier B.V.
Pages: - Volume / Issue: 350 (1-2) Sequence Number: - Start / End Page: 246 - 255 Identifier: ISSN: 0925-8388
CoNE: https://pure.mpg.de/cone/journals/resource/954925567746