Journal article
Dehydrogenation kinetics of air-exposed MgH2/Mg2Cu and MgH2/MgCu2 studied with in situ X-ray powder diffraction
The dehydrogenation kinetics of air exposed samples of MgH2/Mg2Cu and MgH2/MgCu2 have been studied with in situ time resolved X-ray powder diffraction. The X-ray setup enabled the recording of full diffraction patterns within 150 s, thereby allowing the study of structural changes combined with simultaneous extraction of kinetic parameters.
Phase fractions as a function of time and temperature were derived from series of consecutive diffraction patterns by numerical integration of selected diffraction peaks. The apparent activation energy for the dehydrogenation of the MgH2/Mg2Cu, and MgH2/MgCu2 sample was found to be 108 kJ/mol and 160 kJ/mol, respectively.
Furthermore, substantially improved dehydrogenation kinetics of MgH2 and resistance towards oxidation of Mg due to the presence of Mg2Cu/MgCu2 are discussed in relation to previous work.
Language: | English |
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Publisher: | Springer Berlin Heidelberg |
Year: | 2006 |
Pages: | 515-521 |
Journal subtitle: | Materials Science and Processing |
ISSN: | 14320630 and 09478396 |
Types: | Journal article |
DOI: | 10.1007/s00339-005-3423-x |
ORCIDs: | 0000-0002-4278-3221 and Vegge, T. |