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Hydrogen desorption kinetics at from samples with different Nb concentrations.
XRD spectra of the Nb sample. The unindexed peaks are due to desorbed Mg layers. In the insert we show the magnification of the diffraction peak.
Selected desorption cycles at for the Nb-doped Mg film (the number of cycles pertinent to the curves are 1, 5, 11, 16, 19, 21, and 29, starting from left to right). It is worth noting the evolution of the curves: from the first to the last, half-reaction time changes from . In the inset we present the desorption cycles pertinent to the Nb-doped sample.
Evaluated values of the half-reaction time , order of reaction , and activation energy of samples with different Nb concentrations (see text).
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