Reversible hydrogen storage in NaF-Al composites

Summary, in English

This work demonstrates that hydrogen can be reversibly stored in a composite of NaF and Al. NaF and Al reacts to a mixture of Na3AlF6 and NaAlH4 via hydridofluoride phases of the form Na3AlH6-xFx. The analysis of thermodynamics based on literature standard enthalpies of formation yields the technically favourable enthalpy of reaction of roughly 35 kJ/mol H-2 for a theoretical gravimetric hydrogen storage capacity of 3.3 wt%. Reaction mechanisms are discussed with respect to substitution of hydrogen by fluorine in complex hydrides. (C) 2008 Elsevier B.V. All rights reserved.

• Författare: N. Eigen; U. Boesenberg; J. Bellosta von Colbe; T. R. Jensen; Yngve Cerenius; M. Dornheim; T. Klassen; R. Bormann
• Avdelning/ar: MAX IV-laboratoriet
• Publiceringsår: 2009
• Språk: Engelska
• Sidor: 76-80
• Publikation/Tidskrift/Serie: Journal of Alloys and Compounds
• Volym: 477
• Issue: 1-2
• Länkar: http://dx.doi.org/10.1016/j.jallcom.2008.10.002
• Dokumenttyp: Artikel i tidskrift
• Förlag: Elsevier
• Ämne: Natural Sciences; Physical Sciences
• Nyckelord: Hydrogen storage materials; Milling; X-ray diffraction; diffraction; Neutron; Calorimetry
• Status: Published
• ISBN/ISSN/Övrigt: ISSN: 0925-8388