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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

MPS-Authors

Bogdanović,  B.
Research Group Bogdanović, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Felderhoff,  M.
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Germann,  M.
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Härtel,  M.
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Pommerin,  A.
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Schüth,  F.
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Weidenthaler,  C.
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Zibrowius,  B.
Service Department Mynott (NMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

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.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-98B3-F
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.