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Unusual oxidation behavior of light metal hydride by tetrahydrofuran solvent molecules confined in ordered mesoporous carbon

Klose, Markus and Lindemann, Inge and Minella, Christian Bonatto and Pinkert, Katja and Zier, Martin and Giebeler, Lars and Nolis, Pau and Baró, Maria Dolors and Oswald, Steffen and Gutfleisch, Oliver and Ehrenberg, Helmut and Eckert, Jürgen (2014):
Unusual oxidation behavior of light metal hydride by tetrahydrofuran solvent molecules confined in ordered mesoporous carbon.
In: Journal of Materials Research, Cambridge Journals, pp. 55-63, 29, (01), ISSN 0884-2914, [Online-Edition: http://dx.doi.org/10.1557/jmr.2013.199],
[Article]

Abstract

Confining light metal hydrides in micro- or mesoporous scaffolds is considered to be a promising way to overcome the existing challenges for these materials, e.g. their application in hydrogen storage. Different techniques exist which allow us to homogeneously fill pores of a host matrix with the respective hydride, thus yielding well defined composite materials. For this report, the ordered mesoporous carbon CMK-3 was taken as a support for LiAlH4 realized by a solution impregnation method to improve the hydrogen desorption behavior of LiAlH4 by nanoconfinement effects. It is shown that upon heating, LiAlH4 is unusually oxidized by coordinated tetrahydrofuran solvent molecules. The important result of the herein described work is the finding of a final composite containing nanoscale aluminum oxide inside the pores of the CMK-3 carbon host instead of a metal or alloy. This newly observed unusual oxidation behavior has major implications when applying these compounds for the targeted synthesis of homogeneous metal–carbon composite materials.

Item Type: Article
Erschienen: 2014
Creators: Klose, Markus and Lindemann, Inge and Minella, Christian Bonatto and Pinkert, Katja and Zier, Martin and Giebeler, Lars and Nolis, Pau and Baró, Maria Dolors and Oswald, Steffen and Gutfleisch, Oliver and Ehrenberg, Helmut and Eckert, Jürgen
Title: Unusual oxidation behavior of light metal hydride by tetrahydrofuran solvent molecules confined in ordered mesoporous carbon
Language: English
Abstract:

Confining light metal hydrides in micro- or mesoporous scaffolds is considered to be a promising way to overcome the existing challenges for these materials, e.g. their application in hydrogen storage. Different techniques exist which allow us to homogeneously fill pores of a host matrix with the respective hydride, thus yielding well defined composite materials. For this report, the ordered mesoporous carbon CMK-3 was taken as a support for LiAlH4 realized by a solution impregnation method to improve the hydrogen desorption behavior of LiAlH4 by nanoconfinement effects. It is shown that upon heating, LiAlH4 is unusually oxidized by coordinated tetrahydrofuran solvent molecules. The important result of the herein described work is the finding of a final composite containing nanoscale aluminum oxide inside the pores of the CMK-3 carbon host instead of a metal or alloy. This newly observed unusual oxidation behavior has major implications when applying these compounds for the targeted synthesis of homogeneous metal–carbon composite materials.

Journal or Publication Title: Journal of Materials Research
Volume: 29
Number: 01
Publisher: Cambridge Journals
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Functional Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 31 Mar 2014 07:29
Official URL: http://dx.doi.org/10.1557/jmr.2013.199
Identification Number: doi:10.1557/jmr.2013.199
Funders: The authors are indebted to the EU (ERSF) and the Free State of Saxony (SAB Grant No. 14227/2337) within the ADDE — Functional structure design of new high perfor- mance materials via atomic design and defect engineering (Grant No. 14227/2337) , , the European Center for Emerging Materials and Processes Dresden (ECEMP) excellenceclustersB1andD2(SABGrantNos.100112628 and 100111670) for financial support.., The German Federal Ministry of Education and Research (BMBF) is acknowledged for financial support (Grant No. 03KP801) for the JEOL JAMP-9500F auger electron spectrometer.
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