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Catalytic effect of mixed Zr–Fe additives on the hydrogen desorption kinetics of
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Image of FIG. 1.
FIG. 1.

Hydrogen desorbed fraction vs time at various temperatures for the Mg sample with mixed Fe–Zr additives at (◻) , (○) , (▵) , (◇) , (★) , and (▷) . In the inset, we present the Arrhenius plot of the desorption rate constant . The straight line is the least square fit.

Image of FIG. 2.
FIG. 2.

Hydrogen desorbed fraction vs time at of sample with Zr (▵), Fe (○), and Nb (◇) single additives and mixed Fe–Zr additives (◻). The lines are only a guide for the eyes.

Image of FIG. 3.
FIG. 3.

XRD spectra pertinent to Mg samples with mixed Fe–Zr additives (completely activated) after desorption. In the figure, only the Fe reflection peaks are labeled and all others peaks are pertinent to reflections. In the inset we present the Fe (110) reflection peak pertinent to a sample with only the Fe additive, line (a), and to a sample with mixed Fe–Zr additives, line (b). The thick line is the reference position of the Fe (110) peak (Ref. 12).


Generic image for table
Table I.

Evaluated values of the half reaction time at , order of reaction , activation energy , and preexponential factor of pure and samples with different catalysts (Nb, Fe, and ZrFe).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Catalytic effect of mixed Zr–Fe additives on the hydrogen desorption kinetics of MgH2