TITLE

Catalytic effect on hydrogen desorption in Nb-doped microcrystalline MgH2

AUTHOR(S)
Bazzanella, Nicola; Checchetto, Riccardo; Miotello, Antonio
PUB. DATE
November 2004
SOURCE
Applied Physics Letters;11/29/2004, Vol. 85 Issue 22, p5212
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Mg and Nb-doped Mg films were deposited by rf magnetron sputtering. Morphological and structural analysis were performed by scanning electron microscopy and x-ray diffraction. The desorption kinetics has been investigated by using a Sievert-type apparatus. The overall activation energy and the reaction order controlling desorption are (141±5) kJ mol-1 H and n≈4 for Mg and (51±5) kJ mol-1 H and n≈1 for Nb-doped (5 at. %) Mg. It is suggested that Nb atoms dispersed in the MgH2 grains catalyzes the dissociation of the hydride phase and that the rate limiting step in the H2 desorption is given by the H atomic migration through interconnected transformed domains of h-Mg.
ACCESSION #
15244168

 

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