Unusual oxidation behavior of light metal hydride by tetrahydrofuran solvent molecules confined in ordered mesoporous ca
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ge Lindemann and Christian Bonatto Minella IFW Dresden, Institute for Metallic Materials, D-01171 Dresden, Germany; and Institut für Werkstoffwissenschaft, Technische Universität Dresden, D-01069 Dresden, Germany
Katja Pinkert, Martin Zier, and Lars Giebeler IFW Dresden, Institute for Complex Materials, D-01171 Dresden, Germany; and Institut für Werkstoffwissenschaft, Technische Universität Dresden, D-01069 Dresden, Germany
Pau Nolis Servei de Ressonància Magnètica Nuclear (SeRMN), Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
Maria Dolors Baró Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain
Steffen Oswald IFW Dresden, Institute for Complex Materials, D-01171 Dresden, Germany
Oliver Gutfleisch Materials Science, Technische Universität Darmstadt, 64287 Darmstadt, Germany
Helmut Ehrenberg Karlsruhe Institute of Technology (KIT), Institute for Applied Materials (IAM), D-76344 Eggenstein-Leopoldshafen, Germany
Jürgen Eckert IFW Dresden, Institute for Complex Materials, D-01171 Dresden, Germany; and Institut für Werkstoffwissenschaft, Technische Universität Dresden, D-01069 Dresden, Germany (Received 14 May 2013; accepted 19 June 2013)
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.
I. INTRODUCTION
Light metal hydrides such as LiAlH4 or NaAlH4 are currently extensively investigated for their possible application in hydrogen storage systems due to their high hydrogen content of 10.6 and 7.4 wt%, respectively. Among the challenges that still need to be overcome to a)
Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2013.199
introduce these materials into commercially available systems, hampered hydrogen desorption and reabsorption kinetics are probably the most pressing issue.1,2 It has been proposed that confining light metal hydrides into microand mesoporous scaffolds can help to solve some of the current limitations. For that purpose, different lightweight carbon-based materials such as carbon nanotubes3,4 or high surface area5 graphite w
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