High-capacity hydrogen storage in lithium and sodium amidoboranes

The safe and efficient storage of hydrogen is widely recognized as one of the key technological challenges in the transition towards a hydrogen-based energy economy 1 , 2 . Whereas hydrogen for transportation applications is currently stored using cryogenics or high pressure, there is substantial re...

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Veröffentlicht in:Nature Materials, 7(2):138-141 7(2):138-141, 2008-02, Vol.7 (2), p.138-141
Hauptverfasser: Xiong, Zhitao, Yong, Chaw Keong, Wu, Guotao, Chen, Ping, Shaw, Wendy, Karkamkar, Abhi, Autrey, Thomas, Jones, Martin Owen, Johnson, Simon R., Edwards, Peter P., David, William I. F.
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Sprache:eng
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Zusammenfassung:The safe and efficient storage of hydrogen is widely recognized as one of the key technological challenges in the transition towards a hydrogen-based energy economy 1 , 2 . Whereas hydrogen for transportation applications is currently stored using cryogenics or high pressure, there is substantial research and development activity in the use of novel condensed-phase hydride materials. However, the multiple-target criteria accepted as necessary for the successful implementation of such stores have not yet been met by any single material. Ammonia borane, NH 3 BH 3 , is one of a number of condensed-phase compounds that have received significant attention because of its reported release of ∼12 wt% hydrogen at moderate temperatures (∼150  ∘ C). However, the hydrogen purity suffers from the release of trace quantities of borazine. Here, we report that the related alkali-metal amidoboranes, LiNH 2 BH 3 and NaNH 2 BH 3 , release ∼10.9 wt% and ∼7.5 wt% hydrogen, respectively, at significantly lower temperatures (∼90  ∘ C) with no borazine emission. The low-temperature release of a large amount of hydrogen is significant and provides the potential to fulfil many of the principal criteria required for an on-board hydrogen store.
ISSN:1476-1122
1476-4660
DOI:10.1038/nmat2081