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Issue 39, 2009
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Fluorescence XAFS study of NaAlH4 doped with a Ce-based precursor

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Abstract

NaAlH4 doped with CeCl3 was prepared by ball milling and cycled under hydrogen. As-prepared samples and cycled material were investigated by X-ray absorption spectroscopy in order to elucidate the local structure around Ce atoms in the material. It was found that, in contrast to Ti doped NaAlH4, the oxidation state of the Ce(III) remains constant during preparation and cycling. Moreover, there is no formation of a bimetallic entity consisting of Ce and Al which is the case in Ti doped samples. Rather, the first shell around Ce consists of a strongly distorted Cl coordination polyhedron with a coordination number considerably below that of CeCl3. Al atoms are visible as second next neighbors, which indicates that the ball-milled sample is an intimate mixture between CeClx entities and the alanate host matrix. A steady state seems to have been reached after 8 absorption cycles, and no significant changes of the local Ce coordination environment occur after the 9th desorption.

Graphical abstract: Fluorescence XAFS study of NaAlH4 doped with a Ce-based precursor

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Article information


Submitted
16 Feb 2009
Accepted
11 Jun 2009
First published
30 Jul 2009

Phys. Chem. Chem. Phys., 2009,11, 8829-8834
Article type
Paper

Fluorescence XAFS study of NaAlH4 doped with a Ce-based precursor

A. Léon, J. Rothe, K. Chłopek, O. Zabara and M. Fichtner, Phys. Chem. Chem. Phys., 2009, 11, 8829
DOI: 10.1039/B903272J

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