Destabilized LiBH4-NaAlH4 Mixtures Doped with Titanium Based Catalysts

Qing Shi, Xuebin Yu, Robert Feidenhans'l, Tejs Vegge

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    We investigate the hydrogen storage properties of the mixed complex hydride LiBH4-NaAlH4 system, both undoped and doped with a TiCl3 additive. The mixed system is found to initiate a transformation to LiBH4-NaAlH4 after ball-milling, and the doped system is found to have a significant lower hydrogen release temperature compared to the undoped system and that of titanium doped LiAlH4 and NaAlH4 systems. Three dehydrogenation steps with a total of 3.5 wt% released hydrogen are observed for samples with a 2:3 molar ratio, when heated to similar to 210 degrees C under a constant heating ramp in a 1 bar helium atmosphere. A slow hydrogen release is also observed at room temperature in the freshly ball-milled powders due to decomposition of the formed LiAlH4. X-ray powder diffraction spectra shows that the first dehydrogenation step is completed after a couple of days at room temperature. LiNa2AlH6 is found in NaAlH4 rich mixtures at higher temperature, and this phase is found to reversibly discharge and recharge hydrogen at 80 bar and 180 degrees C.
    Original languageEnglish
    JournalJournal of Physical Chemistry C
    Volume112
    Issue number46
    Pages (from-to)18244-18248
    ISSN1932-7447
    DOIs
    Publication statusPublished - 2008

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