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  Complex Rare-Earth Aluminum Hydrides: Mechanochemical Preparation, Crystal Structure and Potential for Hydrogen Storage

Weidenthaler, C., Pommerin, A., Felderhoff, M., Sun, W., Wolverton, C., Bogdanović, B., et al. (2009). Complex Rare-Earth Aluminum Hydrides: Mechanochemical Preparation, Crystal Structure and Potential for Hydrogen Storage. Journal of the American Chemical Society, 131(46), 16735-16743. doi:10.1021/ja9042565.

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 Creators:
Weidenthaler, Claudia1, Author           
Pommerin, André1, Author           
Felderhoff, Michael1, Author           
Sun, Wenhao2, Author
Wolverton, Christopher2, Author
Bogdanović, B.3, Author           
Schüth, Ferdi1, Author           
Affiliations:
1Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
2Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, ou_persistent22              
3Research Group Bogdanovi?, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_persistent22              

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 Abstract: A novel type of complex rare-earth aluminum hydride was prepared by mechanochemical preparation. The crystal structure of the REAlH6 (with RE = La, Ce, Pr, Nd) compounds was calculated by DFT methods and confirmed by preliminary structure refinements. The trigonal crystal structure consists of isolated [AlH6]3− octahedra bridged via [12] coordinated RE cations. The investigation of the rare-earth aluminum hydrides during thermolysis shows a decrease of thermal stability with increasing atomic number of the RE element. Rare-earth hydrides (REHx) are formed as primary dehydrogenation products; the final products are RE-aluminum alloys. The calculated decomposition enthalpies of the rare-earth aluminum hydrides are at the lower end for reversible hydrogenation under moderate conditions. Even though these materials may require somewhat higher pressures and/or lower temperatures for rehydrogenation, they are interesting examples of low-temperature metal hydrides for which reversibility might be reached.

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Language(s): eng - English
 Dates: 2009-06-032009-11-042009-11-25
 Publication Status: Published in print
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/ja9042565
 Degree: -

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Title: Journal of the American Chemical Society
  Other : JACS
  Abbreviation : J. Am. Chem. Soc.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 131 (46) Sequence Number: - Start / End Page: 16735 - 16743 Identifier: ISSN: 0002-7863
CoNE: https://pure.mpg.de/cone/journals/resource/954925376870